Find the volume of a right circular cone with: (i) radius 6cm, height 7cm. (ii) radius 3.5 cm, height 12cm (iii) height 21cm and slant height 28cm.

Explanation

(i) given radius`r= 6cm`
height `h=7cm`

so volume of cone `=(1/3)pi(r^2)h`

`=(1/3)pi(6^2)7`

`=264cm^2`

(ii) given radius`r= 3.5cm`
height `h=12cm`

so volume of cone `=(1/3)pi(r^2)h`

`=(1/3)pi(3.5^2)12`

`=154cm^2`

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