https://decimal-to-binary.com/ploschad-konus.html?id=3

What needs to be found:

Radius R: Forming L:

Radius R: Forming L:

A cone is a geometric shape that is obtained by rotating a right triangle around its leg.
The formula for the area of the entire surface of the cone where R is the radius of rotation, L is the length of the generatrix.

A cone is a geometric shape that is obtained by rotating a right triangle around its leg.
The formula of the area of the lateral surface of the cone where R is the radius of rotation, L is the length of the generatrix.

Solution: