Points A and B lie on a circle centered at point O.

Question

If  what is the ratio of the area of sector AOB to the area of the circle?

A. 

B. 

C. 

D. 

Answer 1

C 1/20

the arc length = radius time theta if the angle theta is measured in radians

arc length = rx

rx/r = x = the angle in radians = pi/10 which is 1/20 of 2pi