Question

5. A right circular cylinder just encloses a sphere of radius r find
a. Surface area of sphere
b. Curved surface area of the cylinder
c. Ratio of the areas obtained in (a) and (b)
​

Answer 1

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