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The radii of the ends of a frustum of a ...

The radii of the ends of a frustum of a cone 45 cm high are 28 cm and 7 cm. Find its volume, the curved surface area and the total surface area.

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Let l & R be the radii of the bottom and top circular ends of a frustum of a cone, respectively and 'h' be the height of the cone.
The volume of the frustum of the cone = `1/2 times 22/7 times 45 (28^2 + 7^2 + 28 times 7 ) cm^3`
`= 22/7 times 15 (784+49 +196) cm^3`
`= 22/7 times 15 times 1029 cm^3`
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