regular polygon
111Radius — For other uses, see Radius (disambiguation). Circle illustration In classical geometry, a radius of a circle or sphere is any line segment from its center to its perimeter. By extension, the radius of a circle or sphere is the length of any such… …
112Ambisonic decoding — This is really the Ambisonic Speaker Decoder page. The Ambisonic B format WXYZ signals define what you should hear. How these signals are presented to you by the speakers for best results, depends on how many speakers you have and where they are …
113Square (geometry) — In Euclidean Geometry geometry, a square is a regular polygon with four equal sides. In Euclidean geometry, it has four 90 degree angles. A square with vertices ABCD would be denoted squarenotation|ABCD. Classification A square (regular… …
114Crystallographic restriction theorem — The crystallographic restriction theorem in its basic form was based on the observation that the rotational symmetries of a crystal are usually limited to 2 fold, 3 fold, 4 fold, and 6 fold. However, quasicrystals can occur with other symmetries …
115Henagon — On a circle, a henagon is a tessellation with a single vertex, and one 360 degree arc. Edges and vertices 1 Schläfli symbol {1} …
116equilateral — 1. adjective Referring to a polygon all of whose sides are of equal length. Not necessarily a regular polygon since the angles can still differ (a regular polygon would also be equiangular). 2. noun An equilateral triangle …
117Johannes Kepler — Infobox Scientist name = Johannes Kepler |175px image width = 175px caption = A 1610 portrait of Johannes Kepler by an unknown artist birth date = Birth date|1571|12|27 birth place = Weil der Stadt near Stuttgart, Germany residence = Baden… …
118Root of unity — The 5th roots of unity in the complex plane In mathematics, a root of unity, or de Moivre number, is any complex number that equals 1 when raised to some integer power n. Roots of unity are used in many branches of mathematics, and are especially …
119Pierpont prime — A Pierpont prime is a prime number of the form:2^u 3^v + 1,for some nonnegative integers u and v . They are named after the mathematician James Pierpont.It is possible to prove that if v = 0 and u > 0, then u must be a power of 2, making the… …
120Octahedron — For the album by The Mars Volta, see Octahedron (album). Regular Octahedron (Click here for rotating model) Type Platonic solid Elements F = 8, E = 12 V = 6 (χ = 2) Faces by sides …
