Question

A sphere, a cylinder and a cone have the same radius and same height.find their curved surface areas.

Answer 1

Sphere height=2r=h

r=h/2

Slant height= √(2r^2+r^2

=√5×r

Ratio=4πr^2:2πr(2r):πr(r√5)

= 4πr^2:4πr^2:πr^2•5

=1:1:√5