Question 67

The curved surface area of a hemisphere is 110.88 sq cm, find its radius?

Solution

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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