the derivatio of the formula of frustum of cone

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soorampalli_keerthana...  correctly gives the derivation for the formula of curved surface area and total surface area of frustum of cone.
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Note: Volume of frustum of the cone can be calculated by subtracting the volume of the smaller cone from the volume of the bigger cone.

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• -8

Let ABC be a cone. A frustum DECB is cut by a plane parallel to its base. Let r1 and r2 be the radii of the ends of the frustum of the cone and h be the height of the frustum of the cone.