-
The height of a circular cylinder is increased six times and the base area is decreased to oneninth of its value. The factor by which the lateral surface of the cylinder increases is
-
- 2
- 1/2
- 2/3
- 3/2
- 2
Correct Option: A
Curved surface of cylinder = 2πrh Now,
| Radius = 2π × | r ; height = 6h | |
| 3 |
| Curved surface = | r × 6h = (2πrh) × 2 | |
| 3 |
∴ Increase will be twice.
