Question 67

The total surface area of a hemisphere is 166.32 sq cm, find its curved surface area?

Solution

Let radius of hemisphere = $$r$$ cm

Total surface area of hemisphere = $$3 \pi r^2 = 166.32$$ ------------(i)

Multiplying equation (i) by $$\frac{2}{3}$$

=> $$\frac{2}{3} \times 3 \pi r^2 = \frac{2}{3} \times 166.32$$

=> Curved Surface area of hemisphere = $$2 \pi r^2 = 2 \times 55.44 = 110.88 cm^2$$

=> Ans - (C)

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