The total surface area of a hemisphere is 41.58 sq cm, find its radius.
Let radius of hemisphere = $$r$$ cm
Total surface area of hemisphere = $$3 \pi r^2 = 41.58$$
=> $$r^2 = \frac{41.58}{3 \pi}$$
=> $$r^2 = 13.86 \times \frac{7}{22}$$
=> $$r^2 = 0.63 \times 7 = 4.41$$
=> $$r = \sqrt{4.41} = 2.1$$ cm
=> Ans - (D)
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