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圆环的面积怎么求公式
更新时间： 2020-10-29 00:00:00  

圆环的面积公式：S环=π（R²-r²），S环=π(R+r)(R-r)=π(R+r)d，d为圆环的宽度。圆中的环形：半径不相等且是同心圆的环绕型图形。圆环面积：外圆面积-内圆面积(圆周率X大半径的平方-圆周率X小半径的平方圆周率X（大半径的平方-小半径的平方）。

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