Question

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

Answer 1

Answer:

$\huge\bold\orange{your Answer}$

Answer 2

Answer:

1:4

Step-by-step explanation:

CSA of cylinder = 2$\pi$rh

new cylinder = r =2r and height=2h

CSA of new cylinder = 2*$\pi$*2r*2h

                                 =8$\pi$rh

ratio of CSA of old and new cylinder

                                        =2$\pi$rh : 8$\pi$rh

                                        =1:4