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  2. Sphere - Wikipedia

    en.wikipedia.org/wiki/Sphere

    An open ball excludes the sphere itself, while a closed ball includes the sphere: a closed ball is the union of the open ball and the sphere, and a sphere is the boundary of a (closed or open) ball. The distinction between ball and sphere has not always been maintained and especially older mathematical references talk about a sphere as a solid.

  3. Ball (mathematics) - Wikipedia

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

    In mathematics, a ball is the solid figure bounded by a sphere; it is also called a solid sphere. [1] It may be a closed ball (including the boundary points that constitute the sphere) or an open ball (excluding them).

  4. Solid geometry - Wikipedia

    en.wikipedia.org/wiki/Solid_geometry

    A solid figure is the region of 3D space bounded by a two-dimensional closed surface; for example, a solid ball consists of a sphere and its interior. Solid geometry deals with the measurements of volumes of various solids, including pyramids , prisms (and other polyhedrons ), cubes , cylinders , cones (and truncated cones ).

  5. Solid angle - Wikipedia

    en.wikipedia.org/wiki/Solid_angle

    The solid angle subtended at the corner of a cube (an octant) or spanned by a spherical octant is π /2 sr, one-eight of the solid angle of a sphere. [1] Solid angles can also be measured in square degrees (1 sr = (180/ π) 2 square degrees), in square arc-minutes and square arc-seconds, or in fractions of the sphere (1 sr = ⁠ 1 / 4 π ...

  6. Spherical segment - Wikipedia

    en.wikipedia.org/wiki/Spherical_segment

    A spherical segment Pair of parallel planes intersecting a sphere forming a spherical segment (i.e., a spherical frustum) Terminology for spherical segments.. In geometry, a spherical segment is the solid defined by cutting a sphere or a ball with a pair of parallel planes.

  7. Fermi surface - Wikipedia

    en.wikipedia.org/wiki/Fermi_surface

    The linear response of a metal to an electric, magnetic, or thermal gradient is determined by the shape of the Fermi surface, because currents are due to changes in the occupancy of states near the Fermi energy. In reciprocal space, the Fermi surface of an ideal Fermi gas is a sphere of radius

  8. Curiosity rover discovers peculiar metal sphere on Mars - AOL

    www.aol.com/news/2016-11-02-curiosity-rover...

    NASA's Curiosity rover has been exploring the surface of Mars since 2012, and it recently came upon a rather puzzling find. While scouring Mars' Mount Sharp earlier this week, the rover stumbled ...

  9. List of solids derived from the sphere - Wikipedia

    en.wikipedia.org/wiki/List_of_solids_derived...

    Solid bounded by Morin surface; Any Genus 0 surface; Solids from intersecting a sphere with other solids or curved planes. Reuleaux tetrahedron; Spherical lens [1]

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