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如何求得立方体的表面积

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共同创作者是 David Jia

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表面积就是所有面的面积之和。立方体上六个面大小相等，所以只要找到一个表面积，再乘以6就可以了。下面介绍方法：

方法 1

方法 1 的 2:

知道一个面的面积的话

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因为所有面全等，所以找出一个面的面积，乘以6即可。你可以用这个公式：6 x s ² 来计算表面积，s是一条边的长度。
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要找出这个值，先得知道立方体的边长，即“s”。这也相当于用长乘以宽求得面积，而这里的长、宽是相等的。假设边长为4 cm，则一个面的面积为(4 cm) ² ，或 16 cm ² 。要记得面积单位是平方单位。
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得到一面的面积以后，只要将其乘以6即得到表面积。16 cm ² x 6 = 96 cm ² 。则立方体的表面积为 96 cm ² 。

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方法 2

方法 2 的 2:

知道立方体的体积的话

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假如说是125 cm ³ 。
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要找出立方根，即找出一个数，使其立方等于体积，或者用计算器也行。不一定都是整数答案。这里125就是完全立方数，立方根是5，这是因为5 x 5 x 5 = 125。因此立方体边长 "s" 就是5。
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现在有边长，代入上一步骤的公式6*s ² 中。边长为5，则表面积是 6 x s ² = 6 x (5 cm) ² 。
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计算得出 6 x (5 cm) ² = 6 x 25 cm ² = 150 cm ² 。

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