If curved surface area of a cylinder is 1320 sq cm and height is 10 cm, find its radius?
Let radius of cylinder = $$r$$ cm and height = 10 cm
Curved surface area of cylinder = $$2 \pi r h = 1320$$
=> $$2 \times \frac{22}{7} \times r \times 10 = 1320$$
=> $$\frac{44}{7} \times r = \frac{1320}{10} = 132$$
=> $$r = 132 \times \frac{7}{44}$$
=> $$r = 3 \times 7 = 21$$ cm
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