# NIELIT 2016 MAR Scientist D: 64

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What is the area of a semicircle with a diameter of $16$ inches?

1. $32 \pi$ square inches
2. $64 \pi$ square inches
3. $128 \pi$ square inches
4. $256 \pi$ square inches

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Area of circle =  $\pi\times r^{2}=\pi \times \frac{d^{2}}{4}=\pi\times \frac{256}{4}=64\pi$ square inches

1 vote

Area of semicircle = $\frac{1}{2} \times$ area of circle $= \frac{\pi r^2}{2}$

Diameter $=16$ inches $\implies$ radius $=8$ inches

Required Area $=\frac{\pi r^2}{2} = \frac{\pi \times 8^2}{2} = 32\pi$ square inches.

Option (A) is correct.

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