求解GWD-3-8题~

nikkoyu · 发表于 2010-8-30 13:06:42

A thin piece of wire 40 meters long is cut into two pieces. One piece is used to form a circle with radius r, and the other is used to form a square. No wire is left over. Which of the following represents the total area, in square meters, of the circular and the square regions in terms of r?
A.pr²B.pr²+ 10 C.pr² + ¼ p²r²D.pr² + (40-2pr)²E.pr²+ (10- ½ pr)^{2

请问答案为什么选E而不选C？}

jonathanpgl · 发表于 2010-8-30 13:14:12

因为分成的这两段可以长度不等，所以要设其中一段为x，另一段为40-x

nikkoyu · 发表于 2010-8-30 13:30:24

哦。明白了！哈，我一直以为是等分的呢！谢谢~

求解GWD-3-8题~

所属分类: GMAT考试

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