一个半圆的周长是30.84cm,求半圆的面积.

发布网友 发布时间：2022-04-23 17:28

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热心网友 时间：2023-10-23 15:43

设半圆的半径为r厘米，则
   2r+πr=30.84
2r+3.14r=30.84
   5.14r=30.84
       r=30.84÷5.14
       r=6
3.14×6²÷2
=3.14×18
=56.52（平方厘米）
答：半圆的面积是56.52平方厘米．

热心网友 时间：2023-10-23 15:44

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