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

CSA of cone = πrl

`=(22/7xx5.25xx10)cm^2 = (22xx0.75xx10)cm^2 = 165cm^2`

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