Q22:
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:
怎么算呢
T点在此有何作用?若RU是圆弧的两个端点的话,解如下:
圆周长为8p, 4p/3 = 1/6 圆周长。3角形ROU(O为圆心)为正3角形。所以,RU=RO=OU=4。
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