求图中阴影部分的面积.( 取3.14
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求图中阴影部分的面积.( 取3.14
![](http://img.wesiedu.com/upload/e/b9/eb9667397fcda5232417c90b84726c56.jpg)
![](http://img.wesiedu.com/upload/e/b9/eb9667397fcda5232417c90b84726c56.jpg)
![求图中阴影部分的面积.( 取3.14](/uploads/image/z/17874830-38-0.jpg?t=%E6%B1%82%E5%9B%BE%E4%B8%AD%E9%98%B4%E5%BD%B1%E9%83%A8%E5%88%86%E7%9A%84%E9%9D%A2%E7%A7%AF%EF%BC%8E%28+%E5%8F%963.14)
该图左右对称 ,故只需求出一半的面积即可.
S/2 = S扇 - S△ = π·10^2·(1/4) - [(10/√2)^2/2]
= 25π - 25
∴S阴 = 50π - 50 = 107 cm^2
S/2 = S扇 - S△ = π·10^2·(1/4) - [(10/√2)^2/2]
= 25π - 25
∴S阴 = 50π - 50 = 107 cm^2