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4. The radius of a spherical "balloon increases from 7 cm to 14 cm as air is being pumped into it. Find the mtio of surface areas of the "balloon in the two cases.

4. The radius of a spherical "balloon increases from 7 cm to 14 cm as air is being pumped into it. Find the mtio of surface areas of the "balloon in the two cases.

Grade:12th pass

1 Answers

Pawan Prajapati
askIITians Faculty 60782 Points
2 years ago
81 = Surface area with radius 7 cm = 4lt(7)2 cm.2. = Surface area with radius 14 cm = 4Jt(14)2 cm2• Si 41t(7)2 1 - = 2 ::::::> 81 : 82 = 1 : 4. 47t(14) 4

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