方法 1
方法 1 的 7:正方形、长方形和平行四边形
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1
测量宽和高。首先要找出该图形的宽和高（也就是说，要找出相邻两边的长度）。
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研究来源
在平行四边形中，就是要找出底和垂直高度，这跟宽和高是一个意思。
现实生活中需要自己进行测量；如果是作业，老师应该会将这些测量值与图形一起列出来。
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2
将边长相乘。将宽和高相乘。假设某个长方形的高为16厘米，宽为42厘米，即为16 x 42。[2]
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研究来源
如果要计算正方形的面积，可以使用计算器求出边长的平方，这样能节省点时间。因此，如果边长是4米，按下计算器上的4和平方键就能得出答案。按平方键能自动将数字与其本身相乘。
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3
得出答案。相乘之后得出的答案就是该图形的面积，写做“平方单位”。因此长方形的面积应该是674平方厘米。
有时候也会被称为是厘米平方，或者在厘米的右上方写个小2代替“平方”两个字。
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方法 2
方法 2 的 7:梯形
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1
先测量。需要测量梯形的上底、下底和垂直高度。上底与下底是两条平行的边，而高则垂直于其中一条边。[3]
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研究来源
现实生活中需要自己进行测量；如果是作业，老师应该会将这些测量值与图形一起列出来。
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2
将上底和下底的边长相加。假设上底为5cm，下底为7cm。相加后得12。
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3
将所得结果除以2。计算后得出6。
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4
将结果乘以高。假设这个梯形的高为6cm。计算后得出36。[4]
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研究来源
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{“smallUrl”:”https://www.wikihow.com/images_en/thumb/4/48/Find-the-Area-of-a-Shape-Step-8-Version-3.jpg/v4-460px-Find-the-Area-of-a-Shape-Step-8-Version-3.jpg”,”bigUrl”:”https://www.wikihow.com/images/thumb/4/48/Find-the-Area-of-a-Shape-Step-8-Version-3.jpg/v4-728px-Find-the-Area-of-a-Shape-Step-8-Version-3.jpg”,”smallWidth”:460,”smallHeight”:345,”bigWidth”:728,”bigHeight”:546,”licensing”:”
5
得出结果。乘以高之后的结果就是梯形的面积。因此对于5x6x7的梯形，面积为36平方厘米。
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方法 3
方法 3 的 7:圆形
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1
找出半径。要求出圆的面积，需要知道半径长度。半径是圆心到圆周的距离。也可以取圆的直径，或者说是圆的宽度，然后除以2就得出半径。[5]
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研究来源
现实生活中需要自己进行测量；如果是作业，老师应该会将这些测量值与图形一起列出来。
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2
将半径平方。用半径乘以半径。假设半径的长度为8米，计算后得出64。
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3
乘以π。π是一个很常用的数字，在很多计算中都会用到。如果有计算器，可以用π这个功能得出非常精确的结果；如果没有，可以四舍五入（忽略一些数字），乘以3.14159就行了。计算得出201.06176。[6]
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研究来源
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4
得出结果。本例中的计算结果201.06176就是圆形的面积。因此结果是201.06176平方米。
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方法 4
方法 4 的 7:扇形
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1
先测量。扇形是圆形的一部分，看起来有点像扇子。需要知道初始圆形的半径，也就是“扇子”的一边，以及圆心角的角度。假设半径为14cm，圆心角为60度。[7]
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研究来源
现实生活中需要自己进行测量；如果是作业，老师应该会将这些测量值与图形一起列出来。
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2
将半径平方。用半径乘以半径。计算后得出196（14×14）。
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3
乘以π。π是一个非常常用的数字，在很多计算当中会用到。如果有计算器，可以用π这个功能得出非常精确的结果；如果没有，可以四舍五入（忽略一些数字），乘以3.14159就行了。计算后得出 615.75164。[8]
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研究来源
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4
将角度除以360。将圆心角的角度除以360（即圆形的角度）。计算后结果大约为0.166。这个数字实际上是不断重复的，但为了方便计算，我们将其四舍五入。
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5
将结果乘以之前得到的数字。将除以360后得到的结果，乘以之前乘以π得出的结果。计算后得出102.214。
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6
得出结果。得出的结果就是扇形的面积，也就是102.214平方厘米。
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方法 5
方法 5 的 7:椭圆形
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1
先测量。计算椭圆形的面积，需要知道两个“半径”的长度，也可以看成是宽度和高度的一半。这是椭圆中心到长边中点的距离和椭圆中心到短边中点的距离。两条半径应该互相垂直。[9]
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研究来源
现实生活中需要自己进行测量；如果是作业，老师应该会将这些测量值与图形一起列出来。
WH.shared.addScrollLoadItem(‘9051f75d372d35add300178117d00b3c’)
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2
将两个半径相乘。假设椭圆的宽为6cm，高为4cm；则半径为3cm及2cm。将两者相乘，得出6（3×2）。
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3
将得出的数字乘以π。π是一个非常常用的数字，在很多计算当中会用到。如果有计算器，可以用π这个功能得出非常精确的结果；如果没有，可以四舍五入（忽略一些数字），只需乘以3.14159。计算后得出18.84954。
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4
得出结果。得出的结果就是椭圆形的面积。也就是说，椭圆形的面积是18.84954平方厘米。
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方法 6
方法 6 的 7:三角形
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1
先测量。你需要知道三角形的底边长和高。只要能量出高度，底边可以是三角形的任意一边。假设三角形的底边为3m，高为1m。[10]
X
研究来源
现实生活中需要自己进行测量；如果是作业，老师应该会将这些测量值与图形一起列出来。
WH.shared.addScrollLoadItem(‘4769407c98b881f25b5e3c3b16604de9’)
{“smallUrl”:”https://www.wikihow.com/images_en/thumb/8/80/Find-the-Area-of-a-Shape-Step-24-Version-3.jpg/v4-460px-Find-the-Area-of-a-Shape-Step-24-Version-3.jpg”,”bigUrl”:”https://www.wikihow.com/images/thumb/8/80/Find-the-Area-of-a-Shape-Step-24-Version-3.jpg/v4-728px-Find-the-Area-of-a-Shape-Step-24-Version-3.jpg”,”smallWidth”:460,”smallHeight”:345,”bigWidth”:728,”bigHeight”:546,”licensing”:”
2
用底乘以高。计算后得出3（3×1）。[11]
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研究来源
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3
将得出的数字除以2。计算后得出1.5。
WH.shared.addScrollLoadItem(‘7fe90ca3eb082ff2c94573844a0f3d09’)
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4
得出结果。得出的结果就是三角形的面积。因此结果为1.5平方米。
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方法 7
方法 7 的 7:复杂图形
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分解图形。先将复杂图形分解为如上所述的几何图形。在家庭作业中，该如何分解应该很清楚；但现实生活中，你可能需要将其分解成很多图形，才能更精确地计算。[12]
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研究来源
可以先寻找直角和平行线。这两种是构成很多图形的基础。
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计算各个图形的面积。用上面提到的方法计算你找到的不同图形的面积。
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将各图形面积相加。将计算的各面积结果相加，得出图形的总面积。
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其他方法。根据形状不同，你也可以尝试使用其他方法。例如，可以试着在原来的图形上增添面积，使其成为一个标准的几何图形，然后从所得结果中减去增加的面积。
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