What Is an Polygon?

What Is a Polygon?

A polygon is a 2-dimensional shape with straight sides.

Dictionary Definition

The Oxford English Dictionary defines a polygon as "a plane figure with many (usually more than four) straight sides and the same number of angles."

More About Polygons

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Regular Polygons

Regular polygons have sides of equal length and equal angles.

Shape Name Number of sides

Triangle (or Trigon)

A regular triangle is an equilateral triangle

3

Quadrilateral (or Tetragon)

A regular quadrilateral is a square

4

Pentagon

5

Hexagon

6

Heptagon

7

Octagon

8

Nonagon

9

Decagon

10

Dodecagon

12

Irregular Polygons

Irregular polygons have sides of different lengths and different angles.

Shape Name Number of sides
Irregular Quadrilateral 4
Irregular Hexagon 6
Irregular Octagon 8

See Also

What is a triangle? What is a square?