Question

Radius of cylinder is doubled keeping its lateral surface area same then its curved surface area is​

Answer 1

Lateral surface area of a cylinder =2πrh.

Let h

1

and h

2

be the heights.

Then 2×

7

22

×r×h

1

=2×

7

22

×2r×h

2

Clearly h

2

=

2

h

1

Answer 2

Answer:

Correct option is

B

halved

Lateral surface area of a cylinder =2πrh. 

Let h1 and h2 be the heights.

Then 2×722×r×h1=2×722×2r×h2

Clearly h2=2h1