Question 63

The curved surface area of a hemisphere is 2772 sq cm, what is its radius? (Take π = 22/7)

Solution

Let radius of hemisphere = $$r$$ cm

=> Curved surface area = $$2 \pi r^2 = 2772$$

=> $$2 \times \frac{22}{7} \times (r)^2 = 2772$$

=> $$(r)^2 = 2772 \times \frac{7}{44}$$

=> $$(r)^2 = 63 \times 7 = 441$$

=> $$r = \sqrt{441} = 21$$ cm

=> Ans - (B)

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