Question

The area of the curved surface of a cone of radius 2r and slant height `1/2`, is

Options

• `pirl`

• `2pirl`

• `1/2pirl`

• `pi (r+l)r`

Answer 1

The formula of the curved surface area of a cone with base radius ‘r’ and slant height ‘l’ is given as

Curved Surface Area = πrl

Here the base radius is given as ‘2r’ and the slant height is given as ‘`l/2`’

Substituting these values in the above equation we have

Curved Surface Area =  `((pi)(2)(r)(l))/2`

= πrl