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  2. Conic section - Wikipedia

    en.wikipedia.org/wiki/Conic_section

    The three types of conic section are the hyperbola, the parabola, and the ellipse; the circle is a special case of the ellipse, though it was sometimes considered a fourth type. The ancient Greek mathematicians studied conic sections, culminating around 200 BC with Apollonius of Perga 's systematic work on their properties.

  3. Eccentricity (mathematics) - Wikipedia

    en.wikipedia.org/wiki/Eccentricity_(mathematics)

    A family of conic sections of varying eccentricity share a focus point and directrix line, including an ellipse (red, e = 1/2), a parabola (green, e = 1), and a hyperbola (blue, e = 2). The conic of eccentricity 0 in this figure is an infinitesimal circle centered at the focus, and the conic of eccentricity ∞ is an infinitesimally separated ...

  4. Hyperbola - Wikipedia

    en.wikipedia.org/wiki/Hyperbola

    This is the equation of an ellipse (<) or a parabola (=) or a hyperbola (>). All of these non-degenerate conics have, in common, the origin as a vertex (see diagram). All of these non-degenerate conics have, in common, the origin as a vertex (see diagram).

  5. Confocal conic sections - Wikipedia

    en.wikipedia.org/wiki/Confocal_conic_sections

    A parabola is the limit curve of a pencil of ellipses with a common vertex and one common focus, as the other focus is moved to infinity to the right, and also the limit curve of a pencil of hyperbolas with a common vertex and one common focus, as the other focus is moved to infinity to the left.

  6. Triangle conic - Wikipedia

    en.wikipedia.org/wiki/Triangle_conic

    Kiepert hyperbola of ABC. The hyperbola passes through the vertices A, B, C, the orthocenter (O) and the centroid (G) of the triangle. 2: Jerabek hyperbola: The conic which passes through the vertices, the orthocenter and the circumcenter of the triangle of reference is known as the Jerabek hyperbola. It is always a rectangular hyperbola.

  7. Conjugate diameters - Wikipedia

    en.wikipedia.org/wiki/Conjugate_diameters

    The ellipse, parabola, and hyperbola are viewed as conics in projective geometry, and each conic determines a relation of pole and polar between points and lines. Using these concepts, "two diameters are conjugate when each is the polar of the figurative point of the other." [5] Only one of the conjugate diameters of a hyperbola cuts the curve.

  8. List of curves - Wikipedia

    en.wikipedia.org/wiki/List_of_curves

    Main page; Contents; Current events; Random article; About Wikipedia; Contact us; Pages for logged out editors learn more

  9. Menaechmus - Wikipedia

    en.wikipedia.org/wiki/Menaechmus

    Menaechmus likely discovered the conic sections, that is, the ellipse, the parabola, and the hyperbola, as a by-product of his search for the solution to the Delian problem. [3] Menaechmus knew that in a parabola y 2 = L x, where L is a constant called the latus rectum , although he was not aware of the fact that any equation in two unknowns ...

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