Question

Find the total surface area of a cone whose radius is r
2
units and slant height

is 2l units .

Answer 1

Answer:

Area of cone = πr(r+√h^2+√r^2)

= 2π (2 + (√2l)^2 +(√2)^2 )

= 2π ( 2+ 2l +2)

=2π ( 4 + 2l ) units