Question

If the ratio of radii of two right circular cylinder is 2 : 3 and the ratio
of their height is 5:3, then the ratio of their curved surface area is
a) 2 : 5
b) 8: 7
c) 10 : 9
d) 16 : 9​

Answer 1

Answer:

10:9

Explanation:

curved surface of cylinder = 2Πrh

c/c' = 2Π (2r) ( 5h) / 2 Π ( 3r) (3h)

curved surface of cylinder 1/curved surface of cylinder 2 = 10: 9