The radius of a spherical balloon increase s from 7 cm to 14 cm as air is pumped into it . find the ratio of surface areas of ballon in two case
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Answer:
1:4
Step-by-step explanation:
R = radius of balloon = 7cm
r = radius of pumped balloon = 14cm
surface area of sphere before inflated / surface area of spherical balloon 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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