15. A toy is in the shape of a cone mounted on a hemisphere of same base radius. If the volume of the toy is 231 cm cube and its diameter is 7 cm, find
the height of the toy.
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Answer:
231=1/3Πr²h+2/3Πr³
231=1/3×22/7×7/2×7/2×h+22/7×7/2×7/2
h=718.6
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