If curved surface area of a cylinder is 1386 sq cm and height

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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)

1. 21 cm.
2. 5.25 cm.
3. 10.5 cm.
4. 15.75 cm.

Correct Option: C

Curved surface area of cylinder = 2πrh
⇒ 2πrh = 1386

⇒ 2 ×	22	× r × 21 = 1386
	7

⇒44 × 3 × r = 1386

⇒ r =	1386	= 10.5 cm.
	44 × 3