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The slant height of the frustum of a cone is 4cm and perimeters of it circular ends are 18cm and 6cm. find curved surface of the frustum?

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Given slant height of cone (r) = 4cm

Let radii of top and bottom circles be r1 and r2

Given perimeters of its ends as 18cm and 6cm

Curved surface area of frustum cone 

Curved surface area of frustum cone = 48cm2

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