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Derive the formula for the curved surfac...

Derive the formula for the curved surface area and total surface area of the frustum of a cone.

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Let `ABC` be a cone. A frustum `DECB` is cut by a plane parallel to its base.
Let `r_1` and `r_2` be the radii of the ends of the frustum of the cone and h be the height of the frustum of the cone.
In `/_ABG` and `/_ADF`, `DF∥BG`
Therefore, `/_ABG∼/_ADF`
`(DF)/(BG)=(AF)/(AG)=(AD)/(AB)`
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