GWD26-29

meckychen · 发表于 2010-1-22 11:12:44

Q29:

The points R, T, and U lie on a circle that has radius 4. If the length of arc RTU is 4p/3, what is the length of line segment RU?

A. 4/3
B. 8/3

C. 3
D. 4
E. 6
Answer: D

How to calculate?

Thanks

我心向明月 · 发表于 2010-1-22 12:43:24

圆周长2P*R=8P

(4P/3) / 8p=1/6

360度*1/6=60度，这是一个等边三角形，三边等长，为4

meckychen · 发表于 2010-1-22 16:13:44

Thank you.

GWD26-29

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