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In geometry, a nonagon (/ ˈ n ɒ n ə ɡ ɒ n /) or enneagon (/ ˈ ɛ n i ə ɡ ɒ n /) is a nine-sided polygon or 9-gon.. The name nonagon is a prefix hybrid formation, from Latin (nonus, "ninth" + gonon), used equivalently, attested already in the 16th century in French nonogone and in English from the 17th century.
5.1 Petrie polygons. 6 References. Toggle the table of contents. ... {24/5} {24/6}=6{4} Interior angle: 165° 150° 135° 120° 105° 90° Form Star polygon Compounds
The regular 65537-gon (one with all sides equal and all angles equal) is of interest for being a constructible polygon: that is, it can be constructed using a compass and an unmarked straightedge. This is because 65,537 is a Fermat prime, being of the form 2 2 n + 1 (in this case n = 4).
5.1 Petrie polygons. 6 Related ... Each angle of a regular hexadecagon is 157.5 degrees, and the total angle measure of any hexadecagon ... Interior angle 67.5° ...
A pentagon is a five-sided polygon. A regular pentagon has 5 equal edges and 5 equal angles. In geometry, a polygon is traditionally a plane figure that is bounded by a finite chain of straight line segments closing in a loop to form a closed chain.
An isotoxal polygon can be labeled as {p α} with outer most internal angle α, and a star polygon {(p/q) α}, with q is a winding number, and gcd(p,q)=1, q<p. Isotoxal tetradecagons have p =7, and since 7 is prime all solutions, q=1..6, are polygons.
F 0 = 3, F 1 = 5, F 2 = 17, F 3 = 257, and F 4 = 65537 (sequence A019434 in the OEIS). Since there are 31 nonempty subsets of the five known Fermat primes, there are 31 known constructible polygons with an odd number of sides. The next twenty-eight Fermat numbers, F 5 through F 32, are known to be composite. [3] Thus a regular n-gon is ...
Dih 15 has 3 dihedral subgroups: Dih 5, Dih 3, and Dih 1. And four more cyclic symmetries: Z 15, Z 5, Z 3, and Z 1, with Z n representing π/n radian rotational symmetry. On the pentadecagon, there are 8 distinct symmetries. John Conway labels these symmetries with a letter and order of the symmetry follows the letter. [3]