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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 | Definition, Properties & Equations | Britannica

    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 – 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

    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 …

  7. 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.

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

    Dec 1, 2025 · So, what exactly is an ellipse? How do we define its equation mathematically? And what makes it different from a circle or a parabola? An ellipse is the set of all points in a plane such that …

  9. 8.1 The Ellipse - College Algebra 2e | OpenStax

    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 …

  10. Ellipse - math word definition- Math Open Reference

    A circle is actually a special case of an ellipse. In an ellipse, if you make the major and minor axis the same length, the result is a circle, with both foci at the center.