help prep ps 1 107

IVANNA · 发表于 2011-6-2 22:46:00

107. 11225-!-item-!-187;#058&007613

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

IVANNA · 发表于 2011-6-2 22:50:24

就是一个正三角内切于一个圆不好意思图粘不上来

rontsai · 发表于 2011-6-2 23:47:19

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.

IVANNA · 发表于 2011-6-3 13:33:45

十分感谢

help prep ps 1 107

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