the radius of a spherical balloon increase from 5 cm to 7.5 cm when air is pumped into it. find the ratio of surface areas of the balloon in two cases
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Step-by-step explanation:
TSA of the ballon in first case =4πr=20π,. TSA of the ballon in the second case =4πr =30π by taking ratio we get 20π/30π= 2/3 so ratio will be 2:3
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