Solution
Let radius of hemisphere = $$r$$ cm
Total surface area of hemisphere = $$3 \pi r^2 = 166.32$$
=> $$r^2 = \frac{166.32}{3 \pi}$$
=> $$r^2 = 55.44 \times \frac{7}{22}$$
=> $$r^2 = 2.52 \times 7 = 17.64$$
=> $$r = \sqrt{17.64} = 4.2$$ cm
=> Ans - (A)
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