A cone is a 3-dimensional solid object that has a circular base and one vertex. Cone is a three-dimensional geometric shape that formed by the locus of all straight line segments to the apex. The surface area of the cone equals the area of the circle plus the area of the cone. Surface area of a cone depends on whether cone is closed or open.

The surface area of a cone whose circular base has radius 'r' and whose slant height is 'l' is SA = $\pi$ r(r + l).

Formula for the surface area of a cone:



Surface Area of a Cone = $\pi$ r(r + l)

Here, l = $\sqrt{ r^2 + h^2}$

r = Radius of a cone
h = Height of a cone
l = Slant height of a cone.