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Polygons

A polygon (Greek for many sides ) is a closed figure drawn in the plane using straight line segments which meet only at their endpoints.

Polygons are named according to their number of sides.

Name
Number of Sides
Triangle
3
Quadrilateral
4
Pentagon
5
Hexagon
6
Heptagon
7
Octagon
8
Nonagon
9
Decagon
10

Hendecagon (or Undecagon, or Unidecagon)

11
Dodecagon
12
n -gon
n

A regular polygon is one in which all interior angles are congruent and all sides are congruent; for example, an equilateral triangle, or a square.