**Navigation**

Topics | Register • News • History • How to • Sequences statistics • Template prototypes |

# Conic section

In geometry a **conic section** is the shape made cutting an imaginary cone at various angles.

They are:

- Circle: formed by cutting through the cone exactly perpendicular to its axis.
- Ellipse: formed by cutting the cone at an angle that is between perpendicular to the axis and parallel to the side.
- Parabola: formed by cutting the cone exactly parallel to the side.
- Hyperbola: formed by cutting the cone either parallel to the axis or any angle between parallel to the axis and parallel to the side of the cone.