Question

The area of the curved surface of a cone is 60 π cm². If the slant height of the cone be 8 cm, find the radius of the base.

Answer 1

Curved surface area(C.S.A)= 60 π cm² 

Slant height of the cone(l) = 8 cm 

We know, 

Curved surface area(C.S.A) = πrl 

⇒ πrl = 60 π 

⇒ r x 8 = 60 

or r = 60/8 

= 7.5 

Therefore, radius of the base of the cone is 7.5 cm.