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TTGWD1-7
A circular mat with diameter 20 inches is placed on a square tabletop, each of whose sides is 24 inches long. Which of the following is closest to the fraction of the tabletop covered by the mat?
A. 5/12
B. 2/5
C. 1/2
D. 3/4
E. 5/6
答案是C
问题一:解法是不是:10*10*3.14/24*24 ?
问题二:大家对于这样的题目怎么估算??
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