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  2. Parabola - Wikipedia

    en.wikipedia.org/wiki/Parabola

    According to the definition of a parabola as a conic section, the boundary of this pink cross-section EPD is a parabola. A cross-section perpendicular to the axis of the cone passes through the vertex P of the parabola. This cross-section is circular, but appears elliptical when viewed obliquely, as is shown in the diagram.

  3. Paraboloid - Wikipedia

    en.wikipedia.org/wiki/Paraboloid

    In geometry, a paraboloid is a quadric surface that has exactly one axis of symmetry and no center of symmetry. The term "paraboloid" is derived from parabola, which refers to a conic section that has a similar property of symmetry. Every plane section of a paraboloid made by a plane parallel to the axis of symmetry is

  4. List of curves - Wikipedia

    en.wikipedia.org/wiki/List_of_curves

    1 Mathematics (Geometry) Toggle Mathematics (Geometry) subsection ... Parabola; Hyperbola. Unit hyperbola; Degree 3 ... a quasi-helical shape characterized by ...

  5. Parabolic arch - Wikipedia

    en.wikipedia.org/wiki/Parabolic_arch

    While a parabolic arch may resemble a catenary arch, a parabola is a quadratic function while a catenary is the hyperbolic cosine, cosh(x), a sum of two exponential functions. One parabola is f(x) = x 2 + 3x − 1, and hyperbolic cosine is cosh(x) = ⁠ e x + e −x / 2 ⁠. The curves are unrelated.

  6. Parabolic - Wikipedia

    en.wikipedia.org/wiki/Parabolic

    Parabolic usually refers to something in a shape of a parabola, but may also refer to a parable. Parabolic may refer to: In mathematics: In elementary mathematics, especially elementary geometry: Parabolic coordinates; Parabolic cylindrical coordinates; parabolic Möbius transformation; Parabolic geometry (disambiguation) Parabolic spiral ...

  7. Focus (geometry) - Wikipedia

    en.wikipedia.org/wiki/Focus_(geometry)

    It is also possible to describe all conic sections in terms of a single focus and a single directrix, which is a given line not containing the focus. A conic is defined as the locus of points for each of which the distance to the focus divided by the distance to the directrix is a fixed positive constant, called the eccentricity e.

  8. Confocal conic sections - Wikipedia

    en.wikipedia.org/wiki/Confocal_conic_sections

    Parabolas have only one focus, so, by convention, confocal parabolas have the same focus and the same axis of symmetry. Consequently, any point not on the axis of symmetry lies on two confocal parabolas which intersect orthogonally (see below). A circle is an ellipse with both foci coinciding at the center.

  9. Geometry - Wikipedia

    en.wikipedia.org/wiki/Geometry

    Geometry (from Ancient Greek γεωμετρία (geōmetría) 'land measurement'; from γῆ (gê) 'earth, land' and μέτρον (métron) 'a measure') [1] is a branch of mathematics concerned with properties of space such as the distance, shape, size, and relative position of figures. [2]

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