Question

Diameter of the base of a cone is 10.5 cm and its slant height is 10 cm. Find its curved surface area.

`["Assume "pi=22/7]`

 

Answer 1

Radius (r) of the base of cone = `(10.5/2)  cm` = 5.25 cm

Slant height (l) of cone = 10 cm

∴ The curved surface area of the cone = πrl

= `(22/7 xx 5.25 xx 10)  cm^2`

= `(22 xx 0.75 xx 10)  cm^2`

= 165 cm²

Therefore, the curved surface area of the cone is 165 cm².