The slant height of a frustum of a cone ...

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

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Given: `l=4 cm `
Circumference of a circular end =`18 cm`
=`2pir_1=18`
=`pir_1=9`...............................(1)
Circumference of other circular end =6 cm
...

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