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标题: gwd12-20 [打印本页]

作者: 虚无飘渺    时间: 2005-10-12 13:10     标题: gwd12-20

图复制不上来,就是一个三角形内接于一个圆的图

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.

答案是A,可是也没有告诉三角形的具体任何数值,也没有半径阿?


作者: winners    时间: 2005-10-12 19:55

你的理解是对的,如果没有给出具体的值,就应该选E.




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