The curved surface area of a hemisphere is 110.88 sq cm, find its radius?
Let radius of hemisphere = $$r$$ cm
Curved surface area of hemisphere = $$2 \pi r^2 = 110.88$$
=> $$r^2 = \frac{110.88}{2 \pi}$$
=> $$r^2 = 55.44 \times \frac{7}{22}$$
=> $$r^2 = 2.52 \times 7 = 17.64$$
=> $$r = \sqrt{17.64} = 4.2$$ cm
=> Ans - (C)
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