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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