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  2. Dual cone and polar cone - Wikipedia

    en.wikipedia.org/wiki/Dual_cone_and_polar_cone

    A cone C in a vector space X is said to be self-dual if X can be equipped with an inner product ⋅,⋅ such that the internal dual cone relative to this inner product is equal to C. [3] Those authors who define the dual cone as the internal dual cone in a real Hilbert space usually say that a cone is self-dual if it is equal to its internal dual.

  3. Annulus (mathematics) - Wikipedia

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

    The area of an annulus is the difference in the areas of the larger circle of radius R and the smaller one of radius r: = = = (+) (). As a corollary of the chord formula, the area bounded by the circumcircle and incircle of every unit convex regular polygon is π /4

  4. Cylinder - Wikipedia

    en.wikipedia.org/wiki/Cylinder

    For a given volume, the right circular cylinder with the smallest surface area has h = 2r. Equivalently, for a given surface area, the right circular cylinder with the largest volume has h = 2 r , that is, the cylinder fits snugly in a cube of side length = altitude ( = diameter of base circle).

  5. Saint Conus - Wikipedia

    en.wikipedia.org/wiki/Saint_Conus

    Cono was a Benedictine monk. He was born in Diano ( Italy ) in the late 12th century, and became a monk in S.Maria di Cadossa Benedictine Monastery (now St. Cono sanctuary) near Montesano sulla Marcellana . [ 1 ]

  6. Rectovesical pouch - Wikipedia

    en.wikipedia.org/wiki/Rectovesical_pouch

    When a man is upright or supine, it is the lowest part of his peritoneal cavity. [3] It may contain parts of the ileum (lower small intestine) and the sigmoid colon. [2] In women, the uterus lies between the rectum and the bladder. Therefore, women do not have a rectovesical pouch, but instead have a rectouterine pouch and vesicouterine pouch.