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Irregular Polygons have sides of differing lengths and angles of differing measure. Unless all the sides of the polygon are of the same length and all the angles are of the same measure the polygon is said to be irregular. The names hexagon, nonagon, pentagon and all the others do not just apply to the regular polygons but rather to any two dimensional closed figure with the number of sides as described by its name. For example the two figures shown below are both pentagons, A is regular and B is irregular. Regular Pentagon: Irregular Pentagon:
Regular Hexagon: Irregular Hexagon:
An irregular polygon can be any two dimensional enclosed space as is shown below.
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Polyhedra & Spherical Geometry Spherical Projection of the Cube
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