a right circular cylinder just encloses a sphere of radius r find
1.surface area of the sphere,
2.curved surface area of the cylinder,
3.ratio of the area obtained in 1 n 2
Dear Student,
(i) Surface area of sphere = 4πr 2
(ii) Height of cylinder = r + r = 2r
Radius of cylinder = r
CSA of cylinder = 2πrh
= 2πr (2r)
= 4πr 2
(iii) 
Therefore, the ratio between these two surface areas is 1:1.
Regards