{"id":2991,"date":"2026-11-03T12:33:52","date_gmt":"2026-11-03T12:33:52","guid":{"rendered":"https:\/\/wpcalc.com\/pt\/matematica\/calculadora-area\/"},"modified":"2026-11-03T12:33:52","modified_gmt":"2026-11-03T12:33:52","slug":"calculadora-area","status":"publish","type":"post","link":"https:\/\/wpcalc.com\/pt\/matematica\/calculadora-area\/","title":{"rendered":"Calculadora de \u00e1rea"},"content":{"rendered":"<section class=\"not-prose calculator-box\" aria-labelledby=\"calculator-title\"><div class=\"flex items-baseline sm:items-center justify-between gap-2 sm:gap-3\"><div class=\"flex flex-col sm:flex-row sm:items-center gap-2\"><span class=\"icon icon-calculator text-primary-700! text-base! dark:text-primary-300!\" aria-hidden=\"true\"><\/span><h2 id=\"calculator-title\" class=\"text-lg font-display font-bold\">Calcule a \u00e1rea de qualquer figura plana<\/h2><\/div><div class=\"calcdash-favorite group\">\n  <button type=\"button\" class=\"favorite\" id=\"favorite\" data-favorite-id=\"2991\" data-favorite-title=\"\u00c1rea\" data-favorite-url=\"https:\/\/wpcalc.com\/pt\/matematica\/calculadora-area\/\" data-favorite-excerpt=\"Calcule a \u00e1rea de um quadrado, ret\u00e2ngulo, tri\u00e2ngulo, c\u00edrculo, elipse, trap\u00e9zio, pol\u00edgono regular, anel e muito mais. Escolha a forma, insira as dimens\u00f5es e obtenha o resultado em metros quadrados, p\u00e9s quadrados, acres e hectares.\" aria-label=\"Adicionar aos favoritos\" data-favorite-icon=\"icon icon-geometry\">\n    <span class=\"icon icon-shape-star-empty\" aria-hidden=\"true\"><\/span>\n  <\/button>\n  <div class=\"calcdash-favorite__tip\" aria-hidden=\"true\">\n   <span class=\"favorite-tooltip\" id=\"favorite-tooltip\"><\/span>\n  <\/div>\n  <span class=\"sr-only\" role=\"status\" id=\"favorite-status\"><\/span>\n<\/div><\/div><form action=\"https:\/\/wpcalc.com\/pt\/matematica\/calculadora-area\/\" method=\"POST\" class=\"calculator\" id=\"calculator-2991\" data-post=\"2991\"><fieldset class=\"fieldset-input is-2\"><legend class=\"sr-only\">Campos de entrada<\/legend><div class=\"field is-single\" id=\"input-1\"><label for=\"field-1\">Figura<\/label><div class=\"grid grid-cols-1\"><select id=\"field-1\" name=\"figura\"><option value=\"square\">Quadrado<\/option><option value=\"rectangle\" selected>Ret\u00e2ngulo<\/option><option value=\"triangle\">Tri\u00e2ngulo<\/option><option value=\"circle\">C\u00edrculo<\/option><option value=\"semicircle\">Semic\u00edrculo<\/option><option value=\"ellipse\">Elipse<\/option><option value=\"parallelogram\">Paralelogramo<\/option><option value=\"trapezoid\">Trap\u00e9zio<\/option><option value=\"rhombus\">Losango (diagonais)<\/option><option value=\"sector\">Setor circular<\/option><option value=\"polygon\">Pol\u00edgono regular<\/option><option value=\"annulus\">Coroa circular (anel)<\/option><\/select><svg class=\"pointer-events-none col-start-1 row-start-1 mr-2 size-5 self-center justify-self-end text-gray-500 sm:size-4\" viewBox=\"0 0 16 16\" fill=\"currentColor\" aria-hidden=\"true\" data-slot=\"icon\">\n              <path fill-rule=\"evenodd\" d=\"M4.22 6.22a.75.75 0 0 1 1.06 0L8 8.94l2.72-2.72a.75.75 0 1 1 1.06 1.06l-3.25 3.25a.75.75 0 0 1-1.06 0L4.22 7.28a.75.75 0 0 1 0-1.06Z\" clip-rule=\"evenodd\" \/>\n            <\/svg><\/div><\/div><div class=\"field is-single\" id=\"input-2\"><label for=\"field-2\">Unidade de comprimento<\/label><div class=\"grid grid-cols-1\"><select id=\"field-2\" name=\"unidade_de_comprimento\"><option value=\"mm\">mm<\/option><option value=\"cm\" selected>cm<\/option><option value=\"m\">m<\/option><option value=\"km\">km<\/option><option value=\"in\">in<\/option><option value=\"ft\">ft<\/option><option value=\"yd\">yd<\/option><option value=\"mi\">mi<\/option><\/select><svg class=\"pointer-events-none col-start-1 row-start-1 mr-2 size-5 self-center justify-self-end text-gray-500 sm:size-4\" viewBox=\"0 0 16 16\" fill=\"currentColor\" aria-hidden=\"true\" data-slot=\"icon\">\n              <path fill-rule=\"evenodd\" d=\"M4.22 6.22a.75.75 0 0 1 1.06 0L8 8.94l2.72-2.72a.75.75 0 1 1 1.06 1.06l-3.25 3.25a.75.75 0 0 1-1.06 0L4.22 7.28a.75.75 0 0 1 0-1.06Z\" clip-rule=\"evenodd\" \/>\n            <\/svg><\/div><\/div><div class=\"is-single field\" id=\"input-3\"><span class=\"font-semibold\">Medidas<\/span><\/div><div class=\"field has-term\" id=\"input-4\"><label for=\"field-4\">Lado a<\/label><div class=\"term\">a<\/div>  <div class=\"absolute bottom-0 left-16 top-8 w-2 h-0.5 bg-blue-500\"><\/div><input type=\"text\" name=\"lado_a\" id=\"field-4\" aria-describedby=\"calc-info-4\" data-number inputmode=\"decimal\" autocomplete=\"off\" spellcheck=\"false\" min=\"0\" value=\"6\"\/><small id=\"calc-info-4\">Lado do quadrado ou do ret\u00e2ngulo, semieixo da elipse ou lado a do trap\u00e9zio.<\/small><\/div><div class=\"field has-term\" id=\"input-5\"><label for=\"field-5\">Lado b<\/label><div class=\"term\">b<\/div>  <div class=\"absolute bottom-0 left-16 top-8 w-2 h-0.5 bg-blue-500\"><\/div><input type=\"text\" name=\"lado_b\" id=\"field-5\" aria-describedby=\"calc-info-5\" data-number inputmode=\"decimal\" autocomplete=\"off\" spellcheck=\"false\" min=\"0\" value=\"4\"\/><small id=\"calc-info-5\">Segundo lado do ret\u00e2ngulo ou do trap\u00e9zio, ou segundo semieixo da elipse.<\/small><\/div><div class=\"field\" id=\"input-6\" hidden><label for=\"field-6\">Dados do tri\u00e2ngulo<\/label><div class=\"grid grid-cols-1\"><select id=\"field-6\" name=\"dados_do_tringulo\"><option value=\"bh\" selected>Base e altura<\/option><option value=\"sss\">Tr\u00eas lados (f\u00f3rmula de Heron)<\/option><\/select><svg class=\"pointer-events-none col-start-1 row-start-1 mr-2 size-5 self-center justify-self-end text-gray-500 sm:size-4\" viewBox=\"0 0 16 16\" fill=\"currentColor\" aria-hidden=\"true\" data-slot=\"icon\">\n              <path fill-rule=\"evenodd\" d=\"M4.22 6.22a.75.75 0 0 1 1.06 0L8 8.94l2.72-2.72a.75.75 0 1 1 1.06 1.06l-3.25 3.25a.75.75 0 0 1-1.06 0L4.22 7.28a.75.75 0 0 1 0-1.06Z\" clip-rule=\"evenodd\" \/>\n            <\/svg><\/div><\/div><div class=\"field has-term\" id=\"input-7\" hidden><label for=\"field-7\">Base<\/label><div class=\"term\">b<\/div>  <div class=\"absolute bottom-0 left-16 top-8 w-2 h-0.5 bg-blue-500\"><\/div><input type=\"text\" name=\"base\" id=\"field-7\" aria-describedby=\"calc-info-7\" data-number inputmode=\"decimal\" autocomplete=\"off\" spellcheck=\"false\" min=\"0\" value=\"8\"\/><small id=\"calc-info-7\">Base do tri\u00e2ngulo ou do paralelogramo.<\/small><\/div><div class=\"field has-term\" id=\"input-8\" hidden><label for=\"field-8\">Altura<\/label><div class=\"term\">h<\/div>  <div class=\"absolute bottom-0 left-16 top-8 w-2 h-0.5 bg-blue-500\"><\/div><input type=\"text\" name=\"altura\" id=\"field-8\" aria-describedby=\"calc-info-8\" data-number inputmode=\"decimal\" autocomplete=\"off\" spellcheck=\"false\" min=\"0\" value=\"5\"\/><small id=\"calc-info-8\">Altura perpendicular \u00e0 base.<\/small><\/div><div class=\"field has-term\" id=\"input-9\" hidden><label for=\"field-9\">Lado a (tri\u00e2ngulo)<\/label><div class=\"term\">a<\/div>  <div class=\"absolute bottom-0 left-16 top-8 w-2 h-0.5 bg-blue-500\"><\/div><input type=\"text\" name=\"lado_a_tringulo\" id=\"field-9\" data-number inputmode=\"decimal\" autocomplete=\"off\" spellcheck=\"false\" min=\"0\" value=\"3\"\/><\/div><div class=\"field has-term\" id=\"input-10\" hidden><label for=\"field-10\">Lado b (tri\u00e2ngulo)<\/label><div class=\"term\">b<\/div>  <div class=\"absolute bottom-0 left-16 top-8 w-2 h-0.5 bg-blue-500\"><\/div><input type=\"text\" name=\"lado_b_tringulo\" id=\"field-10\" data-number inputmode=\"decimal\" autocomplete=\"off\" spellcheck=\"false\" min=\"0\" value=\"4\"\/><\/div><div class=\"field has-term\" id=\"input-11\" hidden><label for=\"field-11\">Lado c<\/label><div class=\"term\">c<\/div>  <div class=\"absolute bottom-0 left-16 top-8 w-2 h-0.5 bg-blue-500\"><\/div><input type=\"text\" name=\"lado_c\" id=\"field-11\" aria-describedby=\"calc-info-11\" data-number inputmode=\"decimal\" autocomplete=\"off\" spellcheck=\"false\" min=\"0\" value=\"5\"\/><small id=\"calc-info-11\">Cada lado deve ser menor que a soma dos outros dois.<\/small><\/div><div class=\"field has-term\" id=\"input-12\" hidden><label for=\"field-12\">Raio<\/label><div class=\"term\">r<\/div>  <div class=\"absolute bottom-0 left-16 top-8 w-2 h-0.5 bg-blue-500\"><\/div><input type=\"text\" name=\"raio\" id=\"field-12\" aria-describedby=\"calc-info-12\" data-number inputmode=\"decimal\" autocomplete=\"off\" spellcheck=\"false\" min=\"0\" value=\"5\"\/><small id=\"calc-info-12\">Raio do c\u00edrculo, semic\u00edrculo ou setor; raio externo da coroa circular.<\/small><\/div><div class=\"field has-term\" id=\"input-13\" hidden><label for=\"field-13\">Raio interno<\/label><div class=\"term\">r<\/div>  <div class=\"absolute bottom-0 left-16 top-8 w-2 h-0.5 bg-blue-500\"><\/div><input type=\"text\" name=\"raio_interno\" id=\"field-13\" aria-describedby=\"calc-info-13\" data-number inputmode=\"decimal\" autocomplete=\"off\" spellcheck=\"false\" min=\"0\" value=\"3\"\/><small id=\"calc-info-13\">Raio do c\u00edrculo interno; deve ser menor que o raio informado acima.<\/small><\/div><div class=\"field has-term\" id=\"input-14\" hidden><label for=\"field-14\">\u00c2ngulo central<\/label><div class=\"term\">\u03b8<\/div>  <div class=\"absolute bottom-0 left-16 top-8 w-2 h-0.5 bg-blue-500\"><\/div><input type=\"text\" name=\"ngulo_central\" id=\"field-14\" aria-describedby=\"calc-info-14\" data-number inputmode=\"decimal\" autocomplete=\"off\" spellcheck=\"false\" min=\"0\" max=\"360\" value=\"90\"\/><small id=\"calc-info-14\">\u00c2ngulo entre os dois raios do setor.<\/small><\/div><div class=\"field\" id=\"input-15\" hidden><label for=\"field-15\">Unidade do \u00e2ngulo<\/label><div class=\"grid grid-cols-1\"><select id=\"field-15\" name=\"unidade_do_ngulo\"><option value=\"deg\" selected>graus (\u00b0)<\/option><option value=\"rad\">radianos (rad)<\/option><\/select><svg class=\"pointer-events-none col-start-1 row-start-1 mr-2 size-5 self-center justify-self-end text-gray-500 sm:size-4\" viewBox=\"0 0 16 16\" fill=\"currentColor\" aria-hidden=\"true\" data-slot=\"icon\">\n              <path fill-rule=\"evenodd\" d=\"M4.22 6.22a.75.75 0 0 1 1.06 0L8 8.94l2.72-2.72a.75.75 0 1 1 1.06 1.06l-3.25 3.25a.75.75 0 0 1-1.06 0L4.22 7.28a.75.75 0 0 1 0-1.06Z\" clip-rule=\"evenodd\" \/>\n            <\/svg><\/div><\/div><div class=\"field has-term\" id=\"input-16\" hidden><label for=\"field-16\">N\u00famero de lados<\/label><div class=\"term\">n<\/div>  <div class=\"absolute bottom-0 left-16 top-8 w-2 h-0.5 bg-blue-500\"><\/div><input type=\"text\" name=\"nmero_de_lados\" id=\"field-16\" data-number inputmode=\"decimal\" autocomplete=\"off\" spellcheck=\"false\" min=\"3\" max=\"1000\" value=\"6\"\/><\/div><div class=\"field has-term\" id=\"input-17\" hidden><label for=\"field-17\">Comprimento do lado<\/label><div class=\"term\">s<\/div>  <div class=\"absolute bottom-0 left-16 top-8 w-2 h-0.5 bg-blue-500\"><\/div><input type=\"text\" name=\"comprimento_do_lado\" id=\"field-17\" data-number inputmode=\"decimal\" autocomplete=\"off\" spellcheck=\"false\" min=\"0\" value=\"10\"\/><\/div><div class=\"field has-term\" id=\"input-18\" hidden><label for=\"field-18\">Diagonal 1<\/label><div class=\"term\">d\u2081<\/div>  <div class=\"absolute bottom-0 left-16 top-8 w-2 h-0.5 bg-blue-500\"><\/div><input type=\"text\" name=\"diagonal_1\" id=\"field-18\" data-number inputmode=\"decimal\" autocomplete=\"off\" spellcheck=\"false\" min=\"0\" value=\"10\"\/><\/div><div class=\"field has-term\" id=\"input-19\" hidden><label for=\"field-19\">Diagonal 2<\/label><div class=\"term\">d\u2082<\/div>  <div class=\"absolute bottom-0 left-16 top-8 w-2 h-0.5 bg-blue-500\"><\/div><input type=\"text\" name=\"diagonal_2\" id=\"field-19\" aria-describedby=\"calc-info-19\" data-number inputmode=\"decimal\" autocomplete=\"off\" spellcheck=\"false\" min=\"0\" value=\"8\"\/><small id=\"calc-info-19\">As diagonais de um losango se cruzam em \u00e2ngulo reto.<\/small><\/div><\/fieldset><div class=\"buttons\"><button type=\"submit\" data-text=\"Recalcular\" id=\"calculate-button\" data-post=\"2991\">Calcular<\/button><button type=\"reset\">Redefinir<\/button><\/div><div class=\"field is-checkbox hidden!\" id=\"field-auto-calc\"><input type=\"checkbox\" id=\"auto-calc\"><label for=\"auto-calc\">Calcular automaticamente<\/label><small>Se ativado, o resultado \u00e9 atualizado automaticamente quando voc\u00ea altera qualquer valor.<\/small><\/div><div class=\"fieldset-result is-hidden\" aria-labelledby=\"result-title\" aria-live=\"polite\" role=\"region\"> <h3 class=\"result-title bg-gradient-to-r from-primary-50 to-gray-50 dark:from-primary-900 dark:to-gray-800\" id=\"result-title\"><span class=\"icon icon-s-pulse\" aria-hidden=\"true\"><\/span> Resultados da \u00e1rea<\/h3><div class=\"result-box\"><div class=\"field-result\" id=\"output-1\"><span class=\"field-title\"><span>\u00c1rea<\/span><span class=\"result-term\">A<\/span><\/span><span class=\"field-value\" id=\"result-1\"><\/span><button type=\"button\" class=\"copy-result\" data-tooltip=\"Copiar resultado\" aria-label=\"Copiar resultado\"><span class=\"copy-icon icon icon-document-copy\" aria-hidden=\"true\"><\/span><\/button><\/div><div class=\"field-result\" id=\"output-2\"><span class=\"field-title\"><span>\u00c1rea em metros quadrados<\/span><\/span><span class=\"field-value\" id=\"result-2\" data-unit=\"m\u00b2\"><\/span><button type=\"button\" class=\"copy-result\" data-tooltip=\"Copiar resultado\" aria-label=\"Copiar resultado\"><span class=\"copy-icon icon icon-document-copy\" aria-hidden=\"true\"><\/span><\/button><\/div><div class=\"field-result\" id=\"output-3\"><span class=\"field-title\"><span>\u00c1rea em p\u00e9s quadrados<\/span><\/span><span class=\"field-value\" id=\"result-3\" data-unit=\"ft\u00b2\"><\/span><button type=\"button\" class=\"copy-result\" data-tooltip=\"Copiar resultado\" aria-label=\"Copiar resultado\"><span class=\"copy-icon icon icon-document-copy\" aria-hidden=\"true\"><\/span><\/button><\/div><div class=\"field-result\" id=\"output-4\"><span class=\"field-title\"><span>\u00c1rea em jardas quadradas<\/span><\/span><span class=\"field-value\" id=\"result-4\" data-unit=\"yd\u00b2\"><\/span><button type=\"button\" class=\"copy-result\" data-tooltip=\"Copiar resultado\" aria-label=\"Copiar resultado\"><span class=\"copy-icon icon icon-document-copy\" aria-hidden=\"true\"><\/span><\/button><\/div><div class=\"field-result\" id=\"output-5\"><span class=\"field-title\"><span>\u00c1rea em acres<\/span><\/span><span class=\"field-value\" id=\"result-5\" data-unit=\"ac\"><\/span><button type=\"button\" class=\"copy-result\" data-tooltip=\"Copiar resultado\" aria-label=\"Copiar resultado\"><span class=\"copy-icon icon icon-document-copy\" aria-hidden=\"true\"><\/span><\/button><\/div><div class=\"field-result\" id=\"output-6\"><span class=\"field-title\"><span>\u00c1rea em hectares<\/span><\/span><span class=\"field-value\" id=\"result-6\" data-unit=\"ha\"><\/span><button type=\"button\" class=\"copy-result\" data-tooltip=\"Copiar resultado\" aria-label=\"Copiar resultado\"><span class=\"copy-icon icon icon-document-copy\" aria-hidden=\"true\"><\/span><\/button><\/div><div class=\"field-result\" id=\"output-7\"><span class=\"field-title\"><span>Per\u00edmetro<\/span><span class=\"result-term\">P<\/span><\/span><span class=\"field-value\" id=\"result-7\"><\/span><button type=\"button\" class=\"copy-result\" data-tooltip=\"Copiar resultado\" aria-label=\"Copiar resultado\"><span class=\"copy-icon icon icon-document-copy\" aria-hidden=\"true\"><\/span><\/button><\/div><div class=\"field-result is-column\" id=\"output-8\"><span class=\"field-title\"><span>F\u00f3rmula com seus valores<\/span><\/span><span class=\"field-value\" id=\"result-8\"><\/span><button type=\"button\" class=\"copy-result\" data-tooltip=\"Copiar resultado\" aria-label=\"Copiar resultado\"><span class=\"copy-icon icon icon-document-copy\" aria-hidden=\"true\"><\/span><\/button><\/div><div class=\"field-result is-column\" id=\"output-9\"><span class=\"field-title\"><span>Diagrama da figura<\/span><\/span><span class=\"field-value\" id=\"result-9\"><\/span><button type=\"button\" class=\"copy-result\" data-tooltip=\"Copiar resultado\" aria-label=\"Copiar resultado\"><span class=\"copy-icon icon icon-document-copy\" aria-hidden=\"true\"><\/span><\/button><\/div><\/div><div class=\"result-actions\"><button type=\"button\" class=\"copy-link\"><svg viewBox=\"0 0 20 20\" fill=\"currentColor\" aria-hidden=\"true\"><path d=\"M12.232 4.232a2.5 2.5 0 0 1 3.536 3.536l-1.225 1.224a.75.75 0 0 0 1.061 1.06l1.224-1.224a4 4 0 0 0-5.656-5.656l-3 3a4 4 0 0 0 .225 5.865.75.75 0 0 0 .977-1.138 2.5 2.5 0 0 1-.142-3.667l3-3Z\"\/><path d=\"M11.603 7.963a.75.75 0 0 0-.977 1.138 2.5 2.5 0 0 1 .142 3.667l-3 3a2.5 2.5 0 0 1-3.536-3.536l1.225-1.224a.75.75 0 0 0-1.061-1.06l-1.224 1.224a4 4 0 1 0 5.656 5.656l3-3a4 4 0 0 0-.225-5.865Z\"\/><\/svg><span class=\"copy-link__text\">Copiar link para este c\u00e1lculo<\/span><\/button><span class=\"sr-only\" role=\"status\" id=\"copy-link-status\"><\/span><\/div><\/div><a href=\"#respond\" class=\"hidden transition-opacity duration-300 opacity-0 w-50 text-sm justify-center items-center gap-2 px-4 py-2 rounded bg-gray-200 text-gray-700 hover:bg-gray-300\" id=\"leave-comment\"><span class=\"icon icon-comments\" aria-hidden=\"true\"><\/span>Deixar um coment\u00e1rio<\/a><\/form><\/section><section id=\"calc-reactions\" class=\"not-prose hidden my-12 bg-gradient-to-r from-primary-50 to-gray-50 border border-indigo-100 rounded-xl px-6 py-4 shadow-sm\" data-post=\"2991\" aria-live=\"polite\" aria-labelledby=\"calc-reactions-title\"><p id=\"calc-reactions-title\" class=\"text-sm text-gray-500 text-center mb-2\">O que voc\u00ea achou deste resultado?<\/p><div role=\"group\" aria-labelledby=\"calc-reactions-title\" class=\"grid grid-cols-3 sm:flex sm:flex-row sm:justify-around gap-4 sm:items-center sm:flex-wrap\"><button type=\"button\" aria-pressed=\"false\" class=\"reaction-btn flex flex-col items-center gap-1 text-sm text-gray-700 hover:text-primary-600 cursor-pointer transition-transform hover:scale-105\" data-reaction=\"like\"><span class=\"reaction-count\" data-reaction-count=\"like\">0<\/span><span class=\"reaction text-3xl\" aria-hidden=\"true\">\ud83d\ude00 <\/span><span class=\"reaction-description font-medium\">Curti <\/span><\/button><button type=\"button\" aria-pressed=\"false\" class=\"reaction-btn flex flex-col items-center gap-1 text-sm text-gray-700 hover:text-primary-600 cursor-pointer transition-transform hover:scale-105\" data-reaction=\"helpful\"><span class=\"reaction-count\" data-reaction-count=\"helpful\">0<\/span><span class=\"reaction text-3xl\" aria-hidden=\"true\">\ud83d\udca1 <\/span><span class=\"reaction-description font-medium\">\u00datil <\/span><\/button><button type=\"button\" aria-pressed=\"false\" class=\"reaction-btn flex flex-col items-center gap-1 text-sm text-gray-700 hover:text-primary-600 cursor-pointer transition-transform hover:scale-105\" data-reaction=\"confused\"><span class=\"reaction-count\" data-reaction-count=\"confused\">0<\/span><span class=\"reaction text-3xl\" aria-hidden=\"true\">\ud83d\ude15 <\/span><span class=\"reaction-description font-medium\">Confuso <\/span><\/button><button type=\"button\" aria-pressed=\"false\" class=\"reaction-btn flex flex-col items-center gap-1 text-sm text-gray-700 hover:text-primary-600 cursor-pointer transition-transform hover:scale-105\" data-reaction=\"disappointed\"><span class=\"reaction-count\" data-reaction-count=\"disappointed\">0<\/span><span class=\"reaction text-3xl\" aria-hidden=\"true\">\ud83d\ude1e <\/span><span class=\"reaction-description font-medium\">Decepcionado <\/span><\/button><button type=\"button\" aria-pressed=\"false\" class=\"reaction-btn flex flex-col items-center gap-1 text-sm text-gray-700 hover:text-primary-600 cursor-pointer transition-transform hover:scale-105\" data-reaction=\"inaccurate\"><span class=\"reaction-count\" data-reaction-count=\"inaccurate\">0<\/span><span class=\"reaction text-3xl\" aria-hidden=\"true\">\u274c <\/span><span class=\"reaction-description font-medium\">Impreciso <\/span><\/button><\/div><div id=\"reaction-message\" class=\"hidden mt-8 rounded-md border border-primary-100 bg-white\/50 backdrop-blur-sm px-4 py-2 text-sm text-center shadow-sm\"><\/div><\/section><div class=\"calcdash-ad not-prose calcdash-ad--calc_result calcdash-ad--in-article\"><ins class=\"adsbygoogle\" style=\"display:block\" data-ad-client=\"ca-pub-1721569815777345\" data-ad-slot=\"6317458308\" data-ad-layout=\"in-article\" data-ad-format=\"fluid\"><\/ins><script>(adsbygoogle = window.adsbygoogle || []).push({});<\/script><\/div>\n<style id=\"wpcoderpro-inline-1\">.formula-box {\r\n\tborder-bottom: none !important;\r\n}<\/style><section class=\"formula-box\" aria-labelledby=\"formula-title\">\r\n\t<div id=\"formula-title\" class=\"not-prose font-display mb-4\"><span class=\"icon icon-formula\" aria-hidden=\"true\"><\/span><h2>F\u00f3rmula da \u00e1rea<\/h2><\/div>\r\n\t<figure class=\"not-prose formula\">\r\n\t\t<figcaption class=\"formula-title\">F\u00f3rmula<\/figcaption>\r\n\t\t<div class=\"text-base text-gray-800\" id=\"formula\">\n\\[ \\begin{aligned} \\text{Quadrado \/ Ret\u00e2ngulo:} \\quad &amp; A = a^2 \\;\\;(a = b) \\qquad A = ab \\\\ \\text{Tri\u00e2ngulo:} \\quad &amp; A = \\tfrac{1}{2}\\,b\\,h \\qquad A = \\sqrt{s(s-a)(s-b)(s-c)},\\; s = \\tfrac{a+b+c}{2} \\\\ \\text{C\u00edrculo:} \\quad &amp; A = \\pi r^2 \\qquad \\text{Semic\u00edrculo: } A = \\tfrac{1}{2}\\pi r^2 \\\\ \\text{Elipse:} \\quad &amp; A = \\pi a b \\\\ \\text{Paralelogramo:} \\quad &amp; A = b\\,h \\qquad \\text{Trapezoid?} A = \\tfrac{1}{2}(a+b)h \\\\ \\text{Losango:} \\quad &amp; A = \\tfrac{1}{2}\\,d_1 d_2 \\\\ \\text{Setor circular:} \\quad &amp; A = \\tfrac{1}{2}\\,r^2\\theta \\quad (\\theta \\text{em radianos}) \\\\ \\text{Pol\u00edgono regular:} \\quad &amp; A = \\frac{n\\,s^2}{4\\tan(\\pi\/n)} \\\\ \\text{Anel (regi\u00e3o anular):} \\quad &amp; A = \\pi(R^2 - r^2) \\end{aligned} \\]\n<\/div>\r\n\t<\/figure>\r\n\t<\/p>\n<p><strong>Em que:<\/strong><\/p>\n<ul>\n<li>\\(a\\), \\(b\\) \u2014 comprimentos dos lados, semi-eixos ou lados paralelos, conforme a forma<\/li>\n<li>\\(h\\) \u2014 altura perpendicular \u00e0 base<\/li>\n<li>\\(r\\), \\(R\\) \u2014 raio (interno) e raio externo<\/li>\n<li>\\(d_1\\), \\(d_2\\) \u2014 diagonais do losango<\/li>\n<li>\\(\\theta\\) \u2014 \u00e2ngulo central do setor<\/li>\n<li>\\(n\\), \\(s\\) \u2014 n\u00famero de lados e comprimento do lado de um pol\u00edgono regular<\/li>\n<\/ul>\n<p>Cada f\u00f3rmula multiplica dois comprimentos perpendiculares, ent\u00e3o a \u00e1rea sempre sai na unidade de comprimento escolhida elevada ao quadrado (por exemplo \\(\\text{cm}^2\\)). Para o setor, o \u00e2ngulo precisa primeiro ser convertido de graus para radianos: \\(\\theta = \\theta_{\\text{deg}} \\cdot \\pi\/180\\).<\/p>\n<p>\r\n<\/section>\n<style id=\"wpcoderpro-inline-2\">.calculation-box {\r\n\tborder-bottom: none !important;\r\n}<\/style><section id=\"calculation\" class=\"calculation-box\" aria-labelledby=\"calculation-title\">\r\n\t<div id=\"calculation-title\" class=\"not-prose font-display\"><span class=\"icon icon-unordered-list\" aria-hidden=\"true\"><\/span><h2>\u00c1rea \u2013 exemplo de c\u00e1lculo<\/h2><\/div>\r\n\r\n<\/p>\n<p><strong>Exemplo:<\/strong> em uma planta baixa, um quarto retangular tem 6 cm de comprimento e 4 cm de largura (valores padr\u00e3o da calculadora), e a unidade est\u00e1 definida em cm.<\/p>\n<p>\\[ A = a \\times b = 6 \\times 4 = 24 \\;\\text{cm}^2 \\]<\/p>\n<p>\\[ P = 2(a + b) = 2 \\times (6 + 4) = 20 \\;\\text{cm} \\]<\/p>\n<p><strong>Resultado:<\/strong> a \u00e1rea \u00e9 24 cm\u00b2 (0,0024 m\u00b2, cerca de 0,258 ft\u00b2) e o per\u00edmetro \u00e9 20 cm. Os mesmos n\u00fameros em metros, em vez de cent\u00edmetros, dariam uma \u00e1rea de 24 m\u00b2 \u2014 por isso o seletor de unidades importa.<\/p>\n<p>\n\r\n<\/section>\n<h2>Como usar a calculadora<\/h2>\n<ol>\n<li>Escolha uma <strong>Forma<\/strong> na lista suspensa \u2014 quadrado, ret\u00e2ngulo, tri\u00e2ngulo, c\u00edrculo, semic\u00edrculo, elipse, paralelogramo, trap\u00e9zio, losango, setor circular, pol\u00edgono regular ou anel (regi\u00e3o anular).<\/li>\n<li>Selecione a <strong>Unidade de comprimento<\/strong> (mm, cm, m, km, in, ft, yd ou mi). Toda dimens\u00e3o digitada \u00e9 interpretada nessa unidade, e a \u00e1rea \u00e9 exibida nessa unidade ao quadrado.<\/li>\n<li>Apenas os campos necess\u00e1rios para a forma escolhida s\u00e3o exibidos em <strong>Dimens\u00f5es<\/strong>. Digite-os como n\u00fameros positivos \u2014 por exemplo, <strong>Lado a<\/strong> e <strong>Lado b<\/strong> para um ret\u00e2ngulo, ou <strong>Raio<\/strong> e <strong>\u00c2ngulo central<\/strong> para um setor.<\/li>\n<li>Para um tri\u00e2ngulo, primeiro escolha o <strong>M\u00e9todo de entrada do tri\u00e2ngulo<\/strong>: base e altura ou tr\u00eas lados (f\u00f3rmula de Heron).<\/li>\n<li>Leia os resultados: a \u00e1rea na sua unidade, convers\u00f5es para metros quadrados, p\u00e9s quadrados, jardas quadradas, acres e hectares, e o per\u00edmetro quando as dimens\u00f5es da forma o definem completamente. Uma f\u00f3rmula passo a passo com seus valores e um diagrama em escala aparecem na parte inferior.<\/li>\n<\/ol>\n<h2>O que \u00e9 \u00e1rea e como interpretar o resultado<\/h2>\n<p>\u00c1rea mede o tamanho de uma superf\u00edcie: quanto espa\u00e7o bidimensional uma forma ocupa. Voc\u00ea encontra em todos os lugares \u2014 a metragem do piso de um quarto, a tinta necess\u00e1ria para uma parede, o terreno em uma escritura, o material para uma lona ou um canteiro. N\u00e3o importa a forma, a ideia \u00e9 a mesma: contar quantos quadrados unit\u00e1rios cabem dentro da figura. Um ret\u00e2ngulo de 6 por 4 unidades cont\u00e9m exatamente 24 quadrados unit\u00e1rios, logo \\(A = 24\\) unidades quadradas.<\/p>\n<p>As f\u00f3rmulas acima s\u00e3o atalhos para essa contagem. Como cada uma combina dois comprimentos, o resultado sempre traz unidades ao quadrado: cent\u00edmetros d\u00e3o cm\u00b2, p\u00e9s d\u00e3o ft\u00b2, quil\u00f4metros d\u00e3o km\u00b2. Misturar unidades sem convert\u00ea-las \u00e9 o erro mais comum, por isso a calculadora fixa uma \u00fanica unidade para todas as entradas e depois converte o resultado para m\u00b2, ft\u00b2, yd\u00b2, acres e hectares \u2014 as cinco unidades mais usadas em constru\u00e7\u00e3o, paisagismo e topografia.<\/p>\n<p>O per\u00edmetro, quando exibido, responde a outra pergunta: n\u00e3o quanto espa\u00e7o a forma ocupa, mas qual o comprimento da sua borda. O comprimento de um cercado \u00e9 um problema de per\u00edmetro; a quantidade de grama, tinta ou piso \u00e9 um problema de \u00e1rea. Um ret\u00e2ngulo longo e estreito e um quadrado compacto podem delimitar a mesma \u00e1rea com per\u00edmetros muito diferentes.<\/p>\n<p>Observe que, em algumas formas, como o c\u00edrculo, o per\u00edmetro \u00e9 a circunfer\u00eancia \\(C = 2\\pi r\\), e no setor \u00e9 o arco mais dois raios. Existem ferramentas mais especializadas se voc\u00ea precisar ir mais a fundo: a <a href=\"https:\/\/wpcalc.com\/en\/mathematics\/triangle-area-calculator\/\">calculadora de \u00e1rea do tri\u00e2ngulo<\/a> cobre mais casos de tri\u00e2ngulo, a <a href=\"https:\/\/wpcalc.com\/pt\/matematica\/calculadora-de-circulo\/\">calculadora de c\u00edrculo<\/a> calcula raio, di\u00e2metro e circunfer\u00eancia, e a <a href=\"https:\/\/wpcalc.com\/pt\/matematica\/calculadora-area-setor-circular\/\">calculadora de \u00e1rea do setor<\/a> e a <a href=\"https:\/\/wpcalc.com\/pt\/matematica\/area-de-poligono-regular\/\">calculadora de \u00e1rea de pol\u00edgono regular<\/a> focam em detalhes nessas duas formas.<\/p>\n<h2>Pressupostos, limita\u00e7\u00f5es e dicas pr\u00e1ticas<\/h2>\n<ul>\n<li><strong>As unidades s\u00e3o compartilhadas por todas as entradas.<\/strong> Se o seu plano mistura metros e cent\u00edmetros, converta primeiro para uma \u00fanica unidade \u2014 ou use a <a href=\"https:\/\/wpcalc.com\/en\/mathematics\/scientific-calculator\/\">calculadora cient\u00edfica<\/a> para fazer isso rapidamente.<\/li>\n<li><strong>As alturas devem ser perpendiculares.<\/strong> Para um tri\u00e2ngulo, paralelogramo ou trap\u00e9zio, digite a altura medida em \u00e2ngulo reto em rela\u00e7\u00e3o \u00e0 base, n\u00e3o o lado obl\u00edquo.<\/li>\n<li><strong>Um tri\u00e2ngulo definido por base e altura n\u00e3o tem per\u00edmetro fixo.<\/strong> A \u00e1rea fica determinada, mas os lados obl\u00edquos podem variar, por isso a calculadora oculta o per\u00edmetro para esse m\u00e9todo de entrada. Com tr\u00eas lados (f\u00f3rmula de Heron), ele \u00e9 simplesmente \\(a + b + c\\).<\/li>\n<li><strong>Os lados do tri\u00e2ngulo precisam satisfazer a desigualdade triangular<\/strong>: cada lado menor que a soma dos outros dois. A calculadora avisa quando isso n\u00e3o acontece.<\/li>\n<li><strong>A entrada do losango usa as diagonais<\/strong>, que devem se cruzar em \u00e2ngulo reto; em um losango, sempre se cruzam. O \u00e2ngulo do setor deve estar entre 0\u00b0 e 360\u00b0 (0 e 2\u03c0 rad).<\/li>\n<li><strong>O pol\u00edgono deve ser regular<\/strong> (todos os lados e \u00e2ngulos iguais). Para um quadril\u00e1tero irregular, divida-o em tri\u00e2ngulos e some as \u00e1reas.<\/li>\n<li><strong>O anel precisa de um raio interno menor que o raio externo.<\/strong> O resultado \u00e9 a \u00e1rea da regi\u00e3o entre os dois c\u00edrculos.<\/li>\n<li><strong>O per\u00edmetro da elipse \u00e9 aproximado<\/strong> (f\u00f3rmula de Ramanujan) \u2014 muito preciso para formas t\u00edpicas, mas n\u00e3o existe f\u00f3rmula elementar exata.<\/li>\n<li><strong>As convers\u00f5es para acres e hectares<\/strong> aparecem automaticamente, o que \u00e9 \u00fatil para terrenos: 1 ha = 10.000 m\u00b2 e 1 acre \u2248 4.046,86 m\u00b2.<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Calcule a \u00e1rea de um quadrado, ret\u00e2ngulo, tri\u00e2ngulo, c\u00edrculo, elipse, trap\u00e9zio, pol\u00edgono regular, anel e muito mais. Escolha a forma, insira as dimens\u00f5es e obtenha o resultado em metros quadrados, p\u00e9s quadrados, acres e hectares.<\/p>\n","protected":false},"author":3168,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[8],"tags":[42],"class_list":["post-2991","post","type-post","status-publish","format-standard","hentry","category-matematica","tag-geometria"],"acf":[],"_links":{"self":[{"href":"https:\/\/wpcalc.com\/pt\/wp-json\/wp\/v2\/posts\/2991","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/wpcalc.com\/pt\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/wpcalc.com\/pt\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/wpcalc.com\/pt\/wp-json\/wp\/v2\/users\/3168"}],"replies":[{"embeddable":true,"href":"https:\/\/wpcalc.com\/pt\/wp-json\/wp\/v2\/comments?post=2991"}],"version-history":[{"count":0,"href":"https:\/\/wpcalc.com\/pt\/wp-json\/wp\/v2\/posts\/2991\/revisions"}],"wp:attachment":[{"href":"https:\/\/wpcalc.com\/pt\/wp-json\/wp\/v2\/media?parent=2991"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/wpcalc.com\/pt\/wp-json\/wp\/v2\/categories?post=2991"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/wpcalc.com\/pt\/wp-json\/wp\/v2\/tags?post=2991"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}