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
搜索了好久没找到,答案选C,请大家指点一下~谢谢
呃。。。如果读懂题意,去除无关信息,画出辅助图,这道题可以简化为:
一个半径为10的圆,一个边长为24的正方形,圆面积占正方形面积的几分之几。
(100*3.14)/(24*24)= 314 / 576,不用求出最后得数,一眼望去,最接近的是C
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