If curved surface area of a cylinder is 1386 sq cm and height is 21 cm, what will be its radius? (Take π = 22/7)
Let radius of cylinder = $$r$$ cm and height, $$h = 21$$ cm
Curved surface area of cylinder = $$2 \pi r h = 1386$$
=> $$2 \times \frac{22}{7} \times r \times 21 = 1386$$
=> $$44 \times 3 \times r = 1386$$
=> $$r = \frac{1386}{44 \times 3} = 10.5$$ cm
=> Ans - (C)
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