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Derive the formula for the volume of the...

Derive the formula for the volume of the frustum of a cone.

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Let's discuss how to derive formula for frustum of a cone.
The volume of the full cone is, `(πR^2 (H + h)) / 3`.
Volume of the cone (with apex) that is cut is, `(πr^2h) / 3`.
We have,
The Volume of frustum of the cone, V = Volume of the full cone - Volume of the cone that is cut
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