意思就是一个半径是2的圆在一个边长是10的正方形里面滚一圈,问圆心走过的路程是多少?
每一边都少走两个半径的长度.
所以列式如下
（10-2*2）*4=24
十万火急!A circle of radius 2 rolls completely around the inside
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