# Difference between revisions of "Polygon"

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# [[Heptagon]] - seven sided. Some coins have been been heptagonal. | # [[Heptagon]] - seven sided. Some coins have been been heptagonal. | ||

# [[Octagon]] - eight sided, used for [[stop sign]]s in the U.S. | # [[Octagon]] - eight sided, used for [[stop sign]]s in the U.S. | ||

+ | # Higher orders of polygons are: [[nonagon]] (9-sided), [[decagon]] (10-sided), [[unodecagon]] (11-sided), [[duodecagon]] (12-sided]] | ||

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[[Category:Geometry]] | [[Category:Geometry]] |

## Revision as of 07:42, 14 May 2007

A **polygon** is a union of disjoint line segments that is path-connected.

A polygon is described as "regular" if all its sides and their included angles are equal.

Types, by number of sides.

- There is no such mathematical entity as a one sided polygon in a plane. (For higher dimensional analogies, see Mobius strip and Klein bottle.)
- As with the one-sided polygon, there is no such thing as a two-sided polygon. (This would be two overlapping line segments.)
- Triangle - three sided, see isosceles triangle, equilateral triangle, right triangle
- Quadrilateral - four sided, see also square, rectangle, rhombus, and trapezoid
- Pentagon - five sided. The most famous one houses the Department of Defense.
- Hexagon - six sided, the shape of a bee hive cell, also used in some board games
- Heptagon - seven sided. Some coins have been been heptagonal.
- Octagon - eight sided, used for stop signs in the U.S.
- Higher orders of polygons are: nonagon (9-sided), decagon (10-sided), unodecagon (11-sided), duodecagon (12-sided]]