# Conic Sections - Ellipses

A series of free, online video lessons with examples and solutions to help Algebra students learn about ellipse conic sections.

### The Ellipse

An ellipse is an important conic section and is formed by intersecting a cone with a plane that does not go through the vertex of a cone. The ellipse is defined by two points, each called a focus. From any point on the ellipse, the sum of the distances to the focus points is constant. The position of the foci determine the shape of the ellipse. The ellipse is related to the other conic sections and a circle is actually a special case of an ellipse.

#### Foci of an Ellipse

Calculating the foci (or focuses) of an Ellipse.

#### Definition Of An Ellipse

This video defines an ellipse and explains how to graph an ellipse in standard form.

#### Graphing An Ellipse In The General Form

This video explains how to graph an ellipse in general form.

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