A joker’s cap is in the form of a right circular cone of base radius 7 cm and height 24 cm. Find the area of the sheet required to make 10 such caps.

Explanation

radius of a joker’s cap `r=7cm`

and height `h=24cm`

so `l=(r^2+h^2)^(1/2)`

`l=(7^2+24^2)^(1/2)`

`l=25cm`

so curve surface area of cap`=pirl`

`=pixx7xx25`

`=550cm^2`

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