半圆的周长是25.7厘米,它的面积是多少平方厘米?
人气:309 ℃ 时间:2019-10-19 16:10:33
解答
半圆的半径是:
25.7÷(3.14+2),
=25.7÷5.14,
=5(厘米);
所以半圆的面积是:
3.14×52÷2=39.25(平方厘米);
答:它的面积是39.25平方厘米.
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