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in Surface Areas And Volumes by (65.5k points)

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

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Slant height of a i frustum of a cone, l = 4 cm. 

Circumference of its circular ends = 18 cm. and 6 cm

∴ Lateral surface area of a frustum of a Cone

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