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圆的面积

圆的面积. 经开区兴隆山中山小学 郭艳花. 我们学过了许多平面图形，你记得这些平面图形的面积的推导过程吗？. 长 = 圆周长的一半. 宽 = 圆的半径. S= （ ） = r 2. 1. 看图计算圆的面积。

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圆的面积

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  1. 圆的面积 经开区兴隆山中山小学 郭艳花

  2. 我们学过了许多平面图形，你记得这些平面图形的面积的推导过程吗？我们学过了许多平面图形，你记得这些平面图形的面积的推导过程吗？

  3. 长=圆周长的一半 宽=圆的半径 S=（ ）=r2

  4. 1.看图计算圆的面积。 • 2.根据下面的条件,求圆的面积。r=6厘米 d =0.8厘米 r=1.5分米3.一块圆形铁板的半径是3分米,它的面积是多少平方分米?4.要求一张圆形纸片的面积,需测量哪些有关数据?比比看谁先做完,谁想的办法多?(1)可测圆的半径,根据S=πr2求出面积。(2)可测圆的直径,根据S=π(d/2)2求出面积。(3)可测圆的周长,根据S=π·(c/2π)2求出面积。

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