小华量得一个树桩顶部的周长约是125.6厘米.这棵树树干的横截面的面积是多少?
人气:399 ℃ 时间:2019-10-26 08:15:42
解答
横截面的半径为:
125.6÷2÷3.14
=62.8÷3.14
=20(厘米),
横截面的面积为:3.14×202=1256(平方厘米).
答:这棵树树干的横截面的面积是1256平方厘米.
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