# Cone area

The first step in determining the surface area of a cone is to measure the radius of the circle, part of the cone. Next, you need to find the area of a circle, or base. As you know, the area of a circle is 3.14 times the square radius (nr2). Now you will need to find the area of the cone itself. To do this, it is necessary to measure the side (tilt height) of the cone.

**Cone surface area in terms of radius and slope**

**Rotation radius r**

**Generating l**

**The lateral surface of the cone through the radius and lateral generatrix**

**Rotation radius r**

**Generating l**