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The radius of a spherical balloon increa...

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

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MBD-Surface Areas and Volumes-Exercise
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  11. Find the suface area of a sphere whose radius is 10 cm : (Take pi=3.14...

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  12. Find the suface area of a sphere whose radius is 5 cm : (Take pi=3.14)...

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  13. Find the surface area of sphere whose radius is 3 cm.

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  14. Find the surface area of a sphere whose diameter is 21 dm.

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  15. The radius of a spherical balloon increases from 6 cm to 12 cm. Compar...

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  16. The dome of a building is in the form of a hemisphere. Its radius is 6...

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  17. Assuming the earth to be a sphere of radius 6370 km, how many square k...

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