Question

iif radii of two circular cylinders are in the ratio 3:4 and their heights are in ratio 6:5. Find the ratio of their curved surface

Answer 1

let cylinder 1 be c1
and cylinder 2 be c2
let radius of c1 = 3x
radius of c2= 4x
let height of c1 = 6y
height of c2 = 5y
Now,C.S.A of c1/C.S.A of c2=
2πrh/2πrh=2*π*3x*6y/2*π*4x*5y=18/20=9/10