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Mathematics 8 Online
OpenStudy (anonymous):

A hard candy has a radius of 9mm. The candy has a spherical soft center with a radius of 6mm, with a hard shell surrounding it. What is the volume of the hard shell. Round the answer to two decimal places.

Directrix (directrix):

The volume of the hard shell is the difference of the volumes of the entire hard candy and that of the soft center. Cross section through center is shown below. |dw:1425493593777:dw|

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