In the diagram above, O is the center if the two concentr...
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
\(\frac{1}{3}\pi cm^2\)
\(\pi cm^2\)
\(3\pi cm^2\)
\(23\pi cm^2\)
\(46\pi cm^2\)
Correct answer is D
\(\frac{120\pi}{360}(R^2 - r^2)\\
\frac{1}{3}\times \pi (13^2 - 10^2)\\
\frac{1}{3}\times \pi \times 69 = 23\pi cm^2\)
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