Given a circle **Ç**contained in a plan , and a point **V** (*vertex*) outside of we call *circular cone *the set of all segments .

## Circular Cone Elements

Given the following cone, we consider the following elements:

height: distance

**H**from the vertex**V**to the plan .generator (

**g**): segment with one end at the point**V**and another at a point in the circumference.base radius: radius

**R**of the circle.rotation axis: straight determined by the center of the circle and the vertex of the cone.

## Straight cone

Every cone whose axis of rotation is perpendicular to the base is called *straight cone*, also called *revolution cone*. It can be generated by the complete rotation of a right triangle around one of its collars.

From the figure, and from the Pythagorean Theorem, we have the following relation:

g^{2} = h^{2} + R^{2} |

## Meridian section

The section determined in a cone of revolution by a plane containing the axis of rotation is called *meridian section.*

If the AVB triangle is equilateral, the cone will also be equilateral: