the radius of a spherical balloon increased from 7 c
m. to 14cm as air is being pumped into it find the ratio of the surface area of the balloon into two cases
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r₁= 7 cm
S.A₁ = 4πr₁²
r₂=14cm
S.A₂= 4πr₂²
S.A₂/ S.A₁= 4π×14×14/4π×7×7=4/1
S.A₂:S.A₁=4:1
S.A₁ = 4πr₁²
r₂=14cm
S.A₂= 4πr₂²
S.A₂/ S.A₁= 4π×14×14/4π×7×7=4/1
S.A₂:S.A₁=4:1
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