
In the figure above, what fraction of the circle with center O is shaded?
A. 1/8
B. 1/4
C. 2/3
D. 3/4
E. 5/6
[spoiler]OA=D[/spoiler]
Source: Princeton Review
A
B
C
D
E
Since the central angle of each white region is 45 degrees, the central angle of each shaded region is 180 - 45 = 135. Thus, (135 + 135)/360 = 270/360 = 3/4 is shaded.