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  3. What is the ratio of the perimeter of a pentagon with each side of length 6 to the perimeter of an octagon with each side of len

What is the ratio of the perimeter of a pentagon with each side of length 6 to the perimeter of an octagon with each side of len

admin2009-05-19  50
问题 What is the ratio of the perimeter of a pentagon with each side of length 6 to the perimeter of an octagon with each side of length 6?
选项 A、5/6
B、6/5
C、3/4
D、2/3
E、5/8
答案E
解析 每条边长都等于6的五边形(pentagon)的周长与每条边长都等于6的八边形(octagon)周长的比率是多少?
解：本题的正确答案为(E)。能否解对本题的关键在于考生是否认得“pentagon”(五边形)和“octagon”(八边形)这两个词，由题意可得：等边五边形的周长/等边六边形的周长=6×5/6×8=5/8
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