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# 平行四边形的面积 PowerPoint PPT Presentation

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## 平行四边形的面积

6

4

24

6

4

24

1、拼出的长方形与原来的平行四边形比面积变了没有？

2、拼出的长方形的长和宽与原来的平行四边形的底和高有什么关系？

3、能否根据长方形的面积计算公式推导出平行四边形面积计算公式？

4m

8m

2

S=ah =8×4=32（m ）

4米

4米

6米

6米

(1) 平行四边形的底是7米,高是4米,面积是28米。( )

(2)两个平行四边形的底相等，它们的面积相等。 ( )

×

×

7分米

8分米

6分米

×

?

h=

6cm

8cm

4cm
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