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  1. Ellipse - Wikipedia

    In mathematics, an ellipse is a plane curve surrounding two focal points, such that for all points on the curve, the sum of both distances to the two focal points is a constant. It generalizes a circle, which is …

  2. Ellipse - Equation, Formula, Properties, Graphing - Cuemath

    Here we shall aim at knowing the definition of an ellipse, the derivation of the equation of an ellipse, and the different standard forms of equations of the ellipse.

  3. Ellipse | Definition, Properties & Equations | Britannica

    Dec 24, 2025 · Ellipse, a closed curve, the intersection of a right circular cone (see cone) and a plane that is not parallel to the base, the axis, or an element of the cone.

  4. Ellipse - Math is Fun

    An ellipse usually looks like a squashed circle ... F is a focus, G is a focus, and together they are called foci. (pronounced fo-sigh)

  5. Ellipse – Definition, Parts, Equation, and Diagrams

    Aug 3, 2023 · An ellipse is a closed curved plane formed by a point moving so that the sum of its distance from the two fixed or focal points is always constant. It is formed around two focal points, …

  6. Ellipse -- from Wolfram MathWorld

    Jan 29, 2026 · The ellipse is a conic section and a Lissajous curve. An ellipse can be specified in the Wolfram Language using Circle [x, y, a, b]. If the endpoints of a segment are moved along two …

  7. Ellipses - Definition, Equations, Types, Properties and Examples | CK ...

    Feb 1, 2026 · Definition of an Ellipse An ellipse is the set of all points in a plane such that the sum of their distances from two fixed points, called foci, is constant.

  8. What Is an Ellipse? Definition, Formula, and Geometric Meaning

    May 16, 2025 · An ellipse is the set of all points in a plane where the sum of the distances to two fixed points (foci) is constant.

  9. What are ellipses? What are their vocabulary words?

    An ellipse is similar to an oval. Important parts of an ellipse are the foci, the vertices, and the axes. It has a real-life use as a reflector.

  10. The Ellipse | Algebra and Trigonometry - Lumen Learning

    This section focuses on the four variations of the standard form of the equation for the ellipse. An ellipse is the set of all points (x, y) in a plane such that the sum of their distances from two fixed points is a …