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Definitions of ellipse:
  • noun:   a closed plane curve resulting from the intersection of a circular cone and a plane cutting completely through it
    Example: "The sums of the distances from the foci to any point on an ellipse is constant"



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Alternative Terms
en nappe apex focal-point locus taut pencil conic-section perpendicular analytic-geometry section each circle geometry point orbit planet comet elliptical-trainer mathematics greek-language distance focus-geometry conical-surface dandelin-spheres curve cartesian-coordinate-system triangle line-segment semi-major-axis semi-minor-axis eccentricity-mathematics origin unit-circle symmetric-matrix diagonal-matrix-2 eigenvalue-eigenvector-and-eigenspace unitary-matrix negative-and-non-negative-numbers ratio gauss-map latus-rectum lowercase polar-coordinate-system area-of-a-disk circumference elliptic-integral series-mathematics approximation srinivasa-ramanujan arc-length inverse-function elliptic-function oblique-projection mirror angle-of-reflection orthogonality national-statuary-hall-collection capitol-hill museum-of-science-and-industry-chicago chicago-that-toddlin-town illinois-college alhambra 17th-century johannes-kepler kepler-s-laws-of-planetary-motion sir-isaac-newton newton-s-law-of-universal-gravitation two-body-problem similarity-2 center-of-mass simple-harmonic-oscillator dimension graphics-device-interface jack-e-bresenham ellipsoid spheroid superellipse hyperbola parabola oval-2 true-anomaly-2 eccentric-anomaly mean-anomaly matrix-representation-of-conic-sections ellipse-proofs fishman-ellipse fenestra-ovalis elliptic-cone-mathematics elliptic-cylinder-mathematics minor-axis-mathematics fresnel-zone central-conic-mathematics elliptic-arch elliptic-conical-surface trajectory keplerian-orbit elliptical-arch elliptically