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  1. Ellipse - Wikipedia

    An ellipse (red) obtained as the intersection of a cone with an inclined plane. Ellipses: examples with increasing eccentricity In mathematics, an ellipse is a plane curve surrounding two focal points, such …

  2. 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.

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

    An ellipse is the locus of a point whose sum of distances from two fixed points is a constant. Its equation is of the form x^2/a^2 + y^2/b^2 = 1, where 'a' is the length of the semi-major axis and 'b' is the length …

  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 -- from Wolfram MathWorld

    Dec 3, 2025 · 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 …

  6. Ellipses - Definition, Equations, Types, Properties and ...

    Dec 1, 2025 · 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.

  7. 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 …