Question

If a sphere, a cylinder and a cone are of the same radius and same height, then the ratio of
their curved surface areas is
A
1:1:2
B 4:4:5
c 2: 13:1
D 2:1:1​

Answer 1

Since, all the areas are having only r as variables, we can eliminate this by taking ratio. So, the ratio of curved surface area of sphere, cylinder and cone is 4:4:√5.