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[Problem Solving]

试题详情

题目:

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?

选项:

A、πr2
B、πr2 + 10
C、πr2 + ¼ π2r2
D、πr2 + (40-2πr)2
E、πr2 + (10- ½ πr)2

答案:

E

提问:

为什么是10-1/2派r方呢?不明白这个式子的意思

解答:

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阅读1142
解答: 姜山

提问:

为什么是10-1/2派r方呢?不明白这个式子的意思

解答:

点赞0
阅读1143
解答: 姜山老师

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