In the circle with center O, the shaded sector represents 20\% of the area of the circle. What is the size of angle AOB?
Answer Choices
A. 36^\circ
B. 72^\circ
C. 90^\circ
D. 80^\circ
E. 70^\circ
In the circle with center O, the shaded sector represents 20\% of the area of the circle. What is the size of angle AOB?
Answer Choices
A. 36^\circ
B. 72^\circ
C. 90^\circ
D. 80^\circ
E. 70^\circ