a circular balloon with a radius of 21 cm is inflated by air. find the size of the air​

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1. Answer:

   Solution:-

   Surface area of sphere = 4πr²

   Surface area of the balloon radius 1.5 cm = 4π*1.5*1.5

   Surface area of the balloon radius 2.5 cm = 4π*2.5*2.5

   Ratio of surface area of resulting balloon to original balloon

   = (4π*2.5*2.5)/(4π*1.5*1.5)

   = (2.5*2.5)/(1.5*1.5)

   = 6.25/2.25

   = 25/9

   Ratio = 25 : 9

   Answer.

   Step-by-step explanation:

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