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A pentagon is a five-sided polygon. A regular pentagon has 5 equal edges and 5 equal angles. ... 90: enneaconta-900: enneahecta- List of n-gons by Greek numerical ...
Uniform polyhedra can be divided between convex forms with convex regular polygon faces and star forms. Star forms have either regular star polygon faces or vertex figures or both. This list includes these: all 75 nonprismatic uniform polyhedra; a few representatives of the infinite sets of prisms and antiprisms;
Technetium (43 Tc) is one of the two elements with Z < 83 that have no stable isotopes; the other such element is promethium. [2] It is primarily artificial, with only trace quantities existing in nature produced by spontaneous fission (there are an estimated 2.5 × 10 −13 grams of 99 Tc per gram of pitchblende) [3] or neutron capture by molybdenum.
The word is a portmanteau of the words thin and insulate, trademarked by 3M. [1] The material is made by the 3M Corporation and was first sold in 1979. [2] It was originally marketed as an inexpensive alternative to down; at the time, 3M claimed it was twice as warm as an equivalent amount of any natural material. [3] [4]
A rectilinear polygon is a polygon all of whose sides meet at right angles. Thus the interior angle at each vertex is either 90° or 270°. Rectilinear polygons are a special case of isothetic polygons. In many cases another definition is preferable: a rectilinear polygon is a polygon with sides parallel to the axes of Cartesian coordinates ...
Armoured repair and recovery vehicle built on the T-90 chassis. Obtained from Russia. [72] BTS-5B Ukraine: 18: Armoured repair and recovery vehicle. 4 purchased from Ukraine in 2007 [73] and 14 in 2012. [74] [75] IMR-2 Soviet Union: Unknown: Engineering vehicle built on the T-72 chassis. [citation needed] IMR-3M Russia: Unknown: Acquired from ...
Shoelace scheme for determining the area of a polygon with point coordinates (,),..., (,). The shoelace formula, also known as Gauss's area formula and the surveyor's formula, [1] is a mathematical algorithm to determine the area of a simple polygon whose vertices are described by their Cartesian coordinates in the plane. [2]
For a polygon bounded by p 1-edges, with a p 2-set as vertex figure and overall symmetry group of order g, we denote the polygon as p 1 (g)p 2. The number of vertices V is then g/p 2 and the number of edges E is g/p 1. The complex polygon illustrated above has eight square edges (p 1 =4) and sixteen vertices (p 2 =2).
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