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  2. Ellipsoid - Wikipedia

    en.wikipedia.org/wiki/Ellipsoid

    This equation reduces to that of the volume of a sphere when all three elliptic radii are equal, and to that of an oblate or prolate spheroid when two of them are equal. The volume of an ellipsoid is ⁠ 2 / 3 ⁠ the volume of a circumscribed elliptic cylinder, and ⁠ π / 6 ⁠ the volume of the circumscribed box.

  3. Ellipse - Wikipedia

    en.wikipedia.org/wiki/Ellipse

    An ellipse (red) obtained as the intersection of a cone with an inclined plane. Ellipse: notations Ellipses: examples with increasing eccentricity. In mathematics, an ellipse is a plane curve surrounding two focal points, such that for all points on the curve, the sum of the two distances to the focal points is a constant.

  4. List of formulas in elementary geometry - Wikipedia

    en.wikipedia.org/wiki/List_of_formulas_in...

    Ellipse where is the ... List of volume formulas – Quantity of three-dimensional space; References This page was last edited on 16 June 2023, at 16:58 (UTC). Text ...

  5. Spheroid - Wikipedia

    en.wikipedia.org/wiki/Spheroid

    The equation of a tri-axial ellipsoid centred at the origin with semi-axes a, ... If A = 2a is the equatorial diameter, and C = 2c is the polar diameter, the volume is

  6. List of formulae involving π - Wikipedia

    en.wikipedia.org/wiki/List_of_formulae_involving_π

    where A is the area enclosed by an ellipse with semi-major axis a and ... where SV is the surface volume of a 3-sphere and r ... More formulas of this nature ...

  7. List of centroids - Wikipedia

    en.wikipedia.org/wiki/List_of_centroids

    Solid semi-ellipsoid of revolution around z-axis a = the radius of the base circle h = the height of the semi-ellipsoid from the base cicle's center to the edge

  8. Flattening - Wikipedia

    en.wikipedia.org/wiki/Flattening

    A circle of radius a compressed to an ellipse. A sphere of radius a compressed to an oblate ellipsoid of revolution. Flattening is a measure of the compression of a circle or sphere along a diameter to form an ellipse or an ellipsoid of revolution respectively. Other terms used are ellipticity, or oblateness.

  9. Earth ellipsoid - Wikipedia

    en.wikipedia.org/wiki/Earth_ellipsoid

    The shape of an ellipsoid of revolution is determined by the shape parameters of that ellipse. The semi-major axis of the ellipse, a, becomes the equatorial radius of the ellipsoid: the semi-minor axis of the ellipse, b, becomes the distance from the centre to either pole. These two lengths completely specify the shape of the ellipsoid.