In the diagram above, O is the center if the two concentric circles of radii 13cm and 10cm respectively. Find the area of the shaded portion in the sector with angle 1200 at the center

A. 1/3πcm2
B. πcm2
C. 3πcm2
D. 23πcm2
E. 46πcm2

Correct Answer: Option E

E. 46πcm2
Explanation
120π/360(R2−r2)

1/3 ×π(13^2−10^2)

1/3×π×69=46πcm2