Question

if a sphere, a cylinder and a cone have the same radius and same height, then ratio of their curved surface areas

Answer 1

csa of cone=pierl=pier×root5r=root5r2
csa of cylinder=2pierh=2pier×2r=4pier2
csa of sphere=4pier2

becz given that height of cone =heightofcylinder=height of sphere=2r

l=rootr2+h2=rootr2+2rwhole2=root5r

ratio=4:4:root5

Answer 2

Hey !!!

Solution is in this attachment

Answer is 4:4:√5
********************"*"**

Hope it helps you !!!

@Rajukumar111