the radius of spherical balloon increases from 7cm to 14cm as airis being pumped into it. find the ratio of surface area of the balloon in the two cases?
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find the ratio of surface area of the
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Answer:
surface area of smaller balloon/surface area of bigger balloon
4pi r²/4pi R²
4×22/7×7×7 / 4×22/7×14×14
88×7 / 88×28
7 / 28
1 / 4
ratio of surface area smaller balloon: bigger balloon surface area =1:4
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