The curved surface area of a frustum of a cone is \pi l\,(r_1 + r_2), where l = \sqrt{h^2 + (r_1 + r_2)^2}, r…

Mathematics Surface Areas and Volumes

The curved surface area of a frustum of a cone is

π l (r_{1} + r_{2})

, where

l = h^{2} + (r_{1} + r_{2})^{2}

r_{1}

and

r_{2}

are the radii of the two ends of the frustum and

h

is the vertical height.

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