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the derivatio of the formula of frustum of cone

Hi!
 
@  soorampalli_keerthana...  correctly gives the derivation for the formula of curved surface area and total surface area of frustum of cone.
Good answer!! We really appreciate your contribution to this forum. Keep posting!
 
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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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.

In ΔABG and ΔADF, DF||BG

∴ ΔABG ∼ ΔADF

CSA of frustum DECB = CSA of cone ABC − CSA cone ADE

CSA of frustum =

 
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