Question

The radius of a spherical balloon increases from 7cm to 14cm.compare the surface areas of the balloon in two cases.
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Answer 1

Answer:

R = radius of ballon = 7cm

r = radius of pumped ballon = 14cm

surface area of sphere before inflated / urface area of spherical ballon after inflated

=4×(22/7)×R×R / 4 × (22/7) × r×r

= R×R/r×r

=7×7/14×14

= 49 / 196

= 1:4

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