A hemisphere lead of radius 9 cm is cast into a right circular cone of height 72 cm. The radius of the base of cone is

3 cm

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6 cm

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4.5 cm

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5.4 cm

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Solution

The correct option is C
4.5 cm

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A hemisphere made of lead of radius $7 c m$ is cast into a right circular cone of height $49 c m .$ Find the radius of the base of the cone.

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