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The radius of a spherical balloon increases from 7 cm to 14 cm as air is being pumped into it. Find the ratio of surface areas of the balloon in two cases.

Asked by Topperlearning User 4th June 2014, 1:23 PM
Answered by Expert
Answer:

Radius of the spherical balloon = r1 = 7 cm

Surface area S1 of the balloon = 4

= 4(7)2

Radius of the spherical balloon when air is pumped into it = r2­

= 14 cm

Surface area S2 of the balloon =

= 4(14)2

Answered by Expert 4th June 2014, 3:23 PM
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