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阿Q吧 > 铺设下水道的水泥管的横截面是个圆环形,外直径是80厘米,内直径是72厘米。求水泥管横截面的面积

铺设下水道的水泥管的横截面是个圆环形,外直径是80厘米,内直径是72厘米。求水泥管横截面的面积

2025-04-04 06:13:40

推荐回答（2个）

回答1：

外半径是80÷2=40厘米
内半径是72÷2=36厘米
3.14×40×40-3.14×36×36=954.56
答：水泥管横截面的面积954.56平方厘米

回答2：

受巨石阵由数十几个完整的，这些柱子排成同心圆组成的块巨石，巨石阵的直径大约有土堆，旁边的56圆形坑里面90米环形周边土沟，因为这是一些坑是由英国考古学家约翰·奥布里发现的，因此被称为“奥布里”坑。

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