If curved surface area of a cylinder is 1386 sq cm and height is 21 cm, what will be its radius? (Take π = $\frac{22}{7}$)

If curved surface area of a cylinder is 1386 sq cm and height is 21 cm, what will be its radius? (Take π = $\frac{22}{7}$)
1). 21 cms
2). 5.25 cms
3). 10.5 cms
4). 15.75 cms

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