Polygons: How Many Sides? - Infoplease

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Search Updated June 26, 2019 | Infoplease Staff Table of contents

A geometrical figure with three or more sides is called a polygon or a polyhedron. Here are the names for some polygons.

3	triangle, trigon
4	quadrilateral, tetragon
5	pentagon
6	hexagon
7	heptagon
8	octagon
9	nonagon, enneagon
10	decagon
11	hendecagon
12	dodecagon, duodecagon
13	triskaidecagon, tridecagon
14	tetrakaidecagon, tetradecagon
15	pentadecagon
16	hexadecagon
17	heptadecagon
18	octadecagon
19	enneadecagon
20	icosagon

How Many Angles?

A polygon has as many angles as it has sides. For example, a triangle has 3 sides and 3 angles. A pentagon has 5 sides and 5 angles. An octadecagon has 18 sides and 18 angles!

Finding Perimeter and Circumference

Numbers and Formulas

Decimal Equivalents of Common Fractions

Finding Perimeter and Circumference Numbers and Formulas Decimal Equivalents of Common Fractions

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