Question

In a cylinder if radius is doubled and height is halved curved surface area will be

Answer 1

The surface area would remain the same.

CSA = 2πrh

When r is doubled it will be 2r when height is halved it will be 1/2h or h/2

So new CSA = 2π × 2r× h/2

2 and 2 will get cancelled

CSA = 2πrh