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The slant heieht of a frustum of a cone is 4cm and the perimeters (circumference) of its circular ends are 18cm and 6cm.

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The slant heieht of a frustum of a cone is 4cm and the perimeters (circumference) of its circular ends are 18cm and 6cm. Find the curved surface area of the frustum.

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We have, slant height, l=4cm
Let R and r be the radii of two circular end respectively. Therefore, we have

Curved surface area of the frustum

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