Polygons and Polyhedra

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Definition of the center of a polygon

A discussion and example of how the interior and exterior angles of a polygon are related, especially when the polygon is concave.

Polygon definition and properties

Definition and properties of parallel lines

octagon

Definition and properties of a nonagon (enneagon)

Definition and properties of a hexagon

Definition and properties of a heptagon

Four different ways to test if polygons are congruent.

This website will lay out the names of polygons according to the number of sides.

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