Ellipse

A conic section with eccentricity less than one. It resembles a squashed circle.

Ellipse is a high school-level concept that would be first encountered in a pre-calculus course covering conic sections. It is listed in the California State Standards for Algebra II.

Examples

Circle:

A circle is the set of points in a plane that are equidistant from a given center point.

Prerequisites

Conic Section:

The conic sections are the classes of nondegenerate curves generated by the intersections of a plane with one or two nappes of a cone. A conic section can also be realized as the zero set of a quadratic equation in two variables.

Classroom Articles on Conic Sections

	Hyperbola	Parabola
	Locus

Classroom Articles on Pre-Calculus (Up to High School Level)

	Asymptote	Natural Logarithm
	Complex Conjugate	Normal Vector
	Complex Number	Parametric Equations
	Complex Plane	Plane
	Cross Product	Plane Curve
	Curve	Polar Coordinates
	Determinant	Range
	Domain	Rational Function
	Dot Product	Reflection
	e	Rotation
	Exponential Function	Rotation Matrix
	Function	Scalar
	i	Spherical Coordinates
	Imaginary Number	Tangent Line
	Inverse Function	Translation
	Logarithm	Vector