已知某钟表的分针长10cm,从1时到4时,分针针尖走过了多少厘米?分针扫过的面积是多少平方厘米?
人气:110 ℃ 时间:2020-02-03 13:53:15
解答
3个小时,走了3圈,走过距离就是周长,为2*3.14*10*3=188.4厘米,扫过面积为:3.14*10^2*3=942平方厘米.
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