Question

The radius of a spherical balloon increases from 5 cm to 10 cm as air is pumped into it
Find the ratio of the surface areas of the balloon in two cases.​

Answer 1

Answer:

1/4

Step-by-step explanation:

Given radius R1= 5 cm

R2 = 10 cm

initial surface area (R1=5cm)= 4πr^2

= 4×(22/7)×5×5

=2200/7 cm^2

surface area (R2=10cm)=4πr^2=4×(22/7)×10×10

=8800/7

Ratio of surface area = (2200/7)/(8800/7)

= 2200/8800

= 1/4