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21. A buoy is made in the form of a hemisphere surmounted by a right cone whose circular base coincides with the plane surface of the hemisphere. The radius of the base of the cone is 3\( \cdot 5 \) metres and its volume is \( \frac { 2 } { 2 } \) of the hemisphere. Calculate the height of the cone and the surface of the buoy correc. to 2 places of decimals. \( \left( \) Take \( \pi = 3 \frac { 1 } { 7 } \right) \quad \) (ICSE

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