Question 89

The total surface area of a hemisphere is 41.58 sq cm, find its radius.

Solution

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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