# Category:Ellipses

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This category contains results about **Ellipses**.

Definitions specific to this category can be found in Definitions/Ellipses.

Let $D$ be a straight line.

Let $F$ be a point.

Let $e \in \R: 0 < e < 1$.

Let $K$ be the locus of points $b$ such that the distance $p$ from $P$ to $D$ and the distance $q$ from $P$ to $F$ are related by the condition:

- $e p = q$

Then $K$ is an **ellipse**.

## Subcategories

This category has the following 5 subcategories, out of 5 total.

## Pages in category "Ellipses"

The following 17 pages are in this category, out of 17 total.

### E

- Ellipse is Bounded in Plane
- Ellipse is Mechanical Curve
- Equation of Chord of Contact on Ellipse in Reduced Form
- Equation of Confocal Ellipses
- Equation of Ellipse in Complex Plane
- Equation of Ellipse in Reduced Form
- Equation of Tangent to Ellipse in Reduced Form
- Equidistance of Ellipse equals Major Axis
- Equivalence of Definitions of Ellipse
- Evolute of Ellipse