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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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PSEB-SURFACE AREAS AND VOLUMES-EXAMPLE
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  7. A corn cob (see Fig. 13.17), shaped somewhat like a cone, has the radi...

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  8. Find the surface area of a sphere of radius 7 cm.

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  11. A hemispherical dome of a building needs to be painted (see Fig. 13.21...

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  18. Find the volume of a sphere of radius 11.2 cm.

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