一个圆环形的铁片,外圆半径是2厘米,内圆半径是1.5厘米,环形面积是()平方厘米
人气:174 ℃ 时间:2019-10-17 01:04:32
解答
3.14×(2×2-1.5×1.5)
=3.14×1.75
=5.495(平方厘米)
答:环形面积是5.495平方厘米
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