The diameters of the ends of a frustum of a cone are 32 cm and 20 cm. If its slant height is 10 cm, then its lateral surface area is `321pic m^2` (b) `300pic m^2` (c) `260pic m^2` (d) `250pic m^2`

Explanation

`r_{1} =frac{32}{2} `


`=16 cm `


`r_{2} =frac{20}{2} `


`=10 cm`



Slant height of cone `=10 cm`


lateral surface area of cone



...