(See also Regular Polygon)
Adjust the polygon below by dragging any orange dot. Note that only the vertex you drag is affected.
An irregular polygon is any
that is not a
It can have sides of any length and each
can be any measure.
They can be
or concave, but all concave polygons are irregular
since the interior angles cannot all be the same. If you drew a polygon at random, it would probably be irregular.
Specific irregular polygons
such as a
have some interesting properties and have their own web pages.
Equilateral means that all sides are the same length. But as can be seen from the figure below, this can still be irregular.
This figure has all sides the same length, but it does not have all angles the same, so it is irregular.
||The vertex (plural: vertices)
is a corner of the polygon. In any polygon, the number of sides and vertices are always equal.
||The sides are the straight
line segments that make up the polygon.
||There is no easy formula for the area of an irregular polygon,
but see Area of a Irregular Polygon for some general approaches to the problem.
||The sum of the lengths of the sides. See
Perimeter of a polygon
Other polygon topics
Types of polygon
Area of various polygon types
Perimeter of various polygon types
Angles associated with polygons
(C) 2011 Copyright Math Open Reference. All rights reserved