A triangle \( P Q R \) is right angled at \( P . P Q=12 \mathrm{~cm} \) and \( P R=16 \mathrm{~c...

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A triangle \( P Q R \) is right angled at \( P . P Q=12 \mathrm{~cm} \) and \( P R=16 \mathrm{~cm} \). It revolves about its hypotenuse. Find the volume of the double cone so formed.
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