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标题: [求助]GWD一道DS题! [打印本页]

作者: documentwei    时间: 2008-3-3 15:07     标题: [求助]GWD一道DS题!

In the figure shown, triangle ABC is inscribed in the circle.  What is the circumference of the circle?

(1)   AB is a diameter of the circle.

(2)   The ratio of the lengths of BC, AC, and AB, respectively, is 3 : 4 : 5.

我选B,可答案是E,为什么?请帮忙!


作者: blueshandys    时间: 2008-3-3 19:27

 圆半径不知道阿
作者: documentwei    时间: 2008-3-5 19:22

哦,对哦!只知道比例!




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