The curved surface area of a frustum of a cone is πl(r1+r2) and l=√h2+(r1−r2)2 where, r1andr2 are the radii of the two ends of the frustum and h is the vertical height.
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Solution
Curved Surface area of a frustum of a cone =πl(r1+r2) where lis the slant height =√h2+(r1−r2)2, his the height, r1 and r2 are the radii of the lower and upper ends of a frustum of a cone.