CBSE Class 9 Answered
The radius of a spherical balloon increases from 2.8 cm to 3.5 cm as air is being pumped into it. Find the ratio of surface areas of the balloon in the two cases
Asked by Topperlearning User | 18 Oct, 2017, 03:13: PM
Expert Answer
Case I: when radius (r) = 2.8 cm
Case II
When radius (R) = 3.5 cm
Therefore, S1: S2 = 16:25
Answered by | 18 Oct, 2017, 05:13: PM
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