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平行四边形面积的推导过程

2014-11-16 10:42:01| 分类：默认分类 | 标签： |举报 |字号大中小订阅

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1、把平行四边形沿着（一条高）剪开，拼成一个（长方形）；

2、这个长方形的长等于平行四边形的（底），长方形的宽等于平行四边形的（高），长方形的面积等于平行四边形的（面积）；

3、因为长方形的面积＝（长）×（宽），所以平行四边形的面积＝底×高，S＝ah。

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