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The radius and height of a cylinder are in the ratio. 5 : 7 and its volume is 550 cm3. Calculate its curved surface area in sq. cm.
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- 110
- 444
- 220
- 616
- 110
Correct Option: C
V = πr²h
⇒ 550 = π × 5x × 5x × 7x
| ⇒ 550 = | × 25 × 7³ | |
| 7 |
| ⇒ x³ = | = 1 ⇒ x = 1 | |
| 22 × 25 |
| ∴ Area of curved surface = 2 × | × 5 × 7 = 220 sq.cm. | |
| 7 |
