Question

4. 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 the two cases,
radius 10 cm. (Use t = 3.14)
bomisnherical bowl made of brocol​

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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