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Sphere
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==See also== {{div col||colwidth=20em}} *[[3-sphere]] *[[Affine sphere]] *[[Alexander horned sphere]] *[[Celestial spheres]] *[[Curvature]] *[[Directional statistics]] *[[Dyson sphere]] *[[Gauss map]] *[[Hand with Reflecting Sphere]], [[M.C. Escher]] self-portrait drawing illustrating reflection and the optical properties of a mirror sphere *[[Hoberman sphere]] *[[Homology sphere]] *[[Homotopy groups of spheres]] *[[Homotopy sphere]] *[[Lenart Sphere]] *[[Napkin ring problem]] *[[Orb (optics)]] *[[Pseudosphere]] *[[Riemann sphere]] *[[Solid angle]] *[[Sphere packing]] *[[Spherical coordinates]] *[[Spherical cow]] *Spherical helix, [[tangent indicatrix]] of a curve of constant precession *[[Spherical polyhedron]] *[[Sphericity]] *[[Tennis ball theorem]] *[[Volume-equivalent radius]] *[[Zoll surface|Zoll sphere]] {{div col end}}
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