Question

A right circular cylinder of radius R = 7cm just encloses a sphere (see Fig.). Find (i) surface area of the sphere, (ii) curved surface area of the cylinder

Answer 1

Answer:ANSWER

(i) SA of sphere =4πr  

2

 

(ii) Height =r+r=2r

radius =r

⇒Curved Surface Area=2πrh=2πr(2r)=4πr  

2

 

(iii) Ratio =  

4πr  

2

 

4πr  

2

 

​  

=  

1

1

​  

 or 1:1