Question

a cylinder has radius r and height h.if the radius and hight of a cylinder are doubled, then a new cylinder is obtained. find the ratio of curved surface area of the original cylinder to that of the new cylinder​

Answer 1

Step-by-step explanation:

the the curved surface area of the original cylinder is 2πrh

if the radius and height of the cylinder are doubled then the radius and height become 2r and 2h respectively.

Then