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mathcentral.uregina.ca/QQ/database/QQ.09.96/rosa1.html

After about 6 sides mathematicians usually refer to these polygons as n-gons. So your 13 sided polygon I would call a 13-gon. Cheers, Walter and Harley Go to Math Central. To return to the previous page use your browser's back button.

www.mathsisfun.com/geometry/polygons

Polygons A polygon is a plane shape with straight sides. Is it a Polygon? Polygons are 2-dimensional shapes. They are made of straight lines, and the shape is "closed" (all the lines connect up).

en.wikipedia.org/wiki/List_of_polygons

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.

www.answers.com/Q/What_is_the_name_of_a_13_sided_polygon

A 13-sided polygon can either be called a triskaidecagon or a tridecagon. What shape is a thirteen sided polygon? The name of a 13 sided polygon is Tridecagon. share:

www.answers.com/Q/What_is_the_size_of_each_interior_angle_of_a_regular_polygon...

What is the size of each interior angle of a regular polygon with 13 sides? ... The interior angles of a 15 sided polygon add up to 2340 degrees and if it is a regular polygon then each interior ...

etc.usf.edu/clipart/37300/37389/13-gon_37389.htm

Source: Florida Center for Instructional Technology Clipart ETC (Tampa, FL: University of South Florida, 2009)

www.ditutor.com/geometry/types_polygons.html

Types of polygons, convex, concave, equilateral, equiangular, regular, irregular, types of polygons based on number of sides, triangle, quadrilateral, pentagon ...

www.quora.com/What-are-some-names-of-polygons-with-more-than-13-sides

What are some names of polygons with more than 13 sides? Personally I like the hendecagon but alas it only has 11 sides. Oh well, here are some from Wikipedia: * Icosidigon (22) * Icositetragon (24) * Icosihexagon (26) * Icosioctagon (28) * Triaco...

www.calculatorsoup.com/calculators/geometry-plane/polygon.php

A regular polygon is a polygon that is both equiangular and equilateral. All sides are equal length placed around a common center so that all angles between sides are also equal. When the number of sides, n, is equal to 3 it is an equilateral triangle and when n = 4 is is a square.

en.wikipedia.org/wiki/Tridecagon

In geometry, a tridecagon or triskaidecagon or 13-gon is a thirteen-sided polygon Regular tridecagon. A regular tridecagon is represented by Schläfli symbol {13}. The measure of each internal angle of a regular tridecagon is approximately 152.308 degrees, and the area with side ...