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15问答网 > 一个圆环，已知外圆的周长是75.36分米，内圆的周长是62.8分米，求圆环的面积

一个圆环，已知外圆的周长是75.36分米，内圆的周长是62.8分米，求圆环的面积

2025-04-04 09:31:19

推荐回答（4个）

回答1：

周长=直径X3.14外圆半径=75.36/（3.14X2）=12分米内圆半径=62.8/（3.14X2）=10分米圆环面积=12X12X3.14-10X10X3.14

回答2：

外圆半径=75.36/(2*3.14)=12dm内圆半径=62.8/(2*3.14)=10dm圆环面积=3.14*(12*12-10*10)=138.16dm^2

回答3：

大圆面积减去小圆面积大圆半径为：75.36/(2*3.14)=12分米小圆半径为：6.28/(2*3.14)=1分米圆环面积：3.14*12^2-3.14*1^2=

回答4：

π【（75.36/2π）�0�5-（62.8/2π)�0�5】=π（12�0�5-10�0�5）=44π=138.16

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