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58问答库 > 一个圆环的外圆半径是三分米内圆半径是两分米这个圆环的面积是多少平方根

一个圆环的外圆半径是三分米内圆半径是两分米这个圆环的面积是多少平方根

2025-03-29 07:10:13

推荐回答（2个）

回答（1）：

圆环面积是大圆面积减去小圆面积
3.14×3×3-3.14×2×2=15.7
答：这个圆环的面积是15.7平方分米

回答（2）：

因为πR²原本是圆外切正6x2ⁿ边形面积必然大于圆面积。根据面积等积变形公理推出：如果圆面积是7a²，那么它的外切正方形面积就是9a²。为此圆面积 s=7(d/3)²。
.所以圆环的面积是：7(3x2/3)²-7(2x2/3)²=140平方寸、约15.56平方分米。

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