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标题: prep ps 1 107 [打印本页]

作者: EthanEthan 时间: 2011-6-16 06:52 标题: prep ps 1 107

107. In the figure above, equilateral triangle ABC is inscribed in the circle. If the length of arc ABC is 24, what is the approximate diameter of the circle?

(A) 5
(B) 8
(C) 11
(D) 15
(E) 19

作者: winny0821 时间: 2011-6-16 21:02

就是一个正三角内切于一个圆不好意思图粘不上来

作者: sylivayjer 时间: 2011-6-19 10:43

I got C
arc ABC is 24, so the perimeter of the circle should be 36.
let diameter of the circle be d, so (pi)d=36, d=36/3.14=11.

作者: EthanEthan 时间: 2011-6-20 06:42

十分感谢!!

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