一只挂钟的时钟长5厘米,分针长8厘米,从上午6时到中午12时,分针尖端走了几厘米,时针"扫过"的面积是几平方厘
人气:389 ℃ 时间:2020-02-04 03:19:01
解答
分针尖端走了:2x3.14x8x6=301.44厘米
时针“扫过”的面积:3.14x5x5除以2=39.25平方厘米
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