In the diagram above O is the center if the two... - WAEC Mathematics 1998 Question
In the diagram above, O is the center if the two concentric circle of radii 13cm and 10cm respectively. Find the area of the shaded portion in the sector with angle 1200 at the center
A
\(\frac{1}{3}\pi cm^2\)
B
\(\pi cm^2\)
C
\(3\pi cm^2\)
D
\(23\pi cm^2\)
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Correct Option: E
(\frac{120\pi}{360}(R^2 - r^2)<br /> \frac{1}{3}\times \pi (13^2 - 10^2)<br /> \frac{1}{3}\times \pi \times 69 = 46\pi cm^2)
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