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A regular digon has both angles equal and both sides equal and is represented by Schläfli symbol {2}. It may be constructed on a sphere as a pair of 180 degree arcs connecting antipodal points, when it forms a lune. The digon is the simplest abstract polytope of rank 2. A truncated digon, t{2} is a square, {4}. An alternated digon, h{2} is a ...
ROCAF F-CK-1A at Ching Chuan Kang Air Base with two TC-1 on the wingtips and two TC-2 underbody ROCAF F-CK-1A underbody have two TC-2. The Sky Sword II, Tien Chien II, or TC-2 (Chinese: 天劍二; pinyin: Tiān Jiàn Èr; Wade–Giles: Tʻien 1 Chien 4 Êrh 4) is a Taiwanese beyond-visual-range air-to-air missile. It has an inertial navigation ...
TC-2, the polar satellite used in the Double Star mission This page was last edited on 11 August 2020, at 09:01 (UTC). Text is available under the Creative Commons ...
Individual polygons are named (and sometimes classified) according to the number of sides, combining a Greek-derived numerical prefix with the suffix -gon, e.g. pentagon, dodecagon. The triangle , quadrilateral and nonagon are exceptions, although the regular forms trigon , tetragon , and enneagon are sometimes encountered as well.
A simple polygon is monotone with respect to a line L, if any line orthogonal to L intersects the polygon at most twice. A monotone polygon can be split into two monotone chains. A polygon that is monotone with respect to the y-axis is called y-monotone. A monotone polygon with n vertices can be triangulated in O(n) time.
The regular finite polygons in 3 dimensions are exactly the blends of the planar polygons (dimension 2) with the digon (dimension 1). They have vertices corresponding to a prism ({n/m}#{} where n is odd) or an antiprism ({n/m}#{} where n is even). All polygons in 3 space have an even number of vertices and edges.
A regular polygon can also be represented by its Coxeter-Dynkin diagram, , and its uniform truncation , and its complete truncation . The graph represents Coxeter group I 2 (n), with each node representing a mirror, and the edge representing the angle π/ n between the mirrors, and a circle is given around one or both mirrors to show which ones ...
In 3-dimensions it will be a zig-zag skew icositetragon and can be seen in the vertices and side edges of a dodecagonal antiprism with the same D 12d, [2 +,24] symmetry, order 48. The dodecagrammic antiprism, s{2,24/5} and dodecagrammic crossed-antiprism, s{2,24/7} also have regular skew dodecagons.