# 9.12: Polygon Classification

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Concave

A concave polygon has at least one interior angle greater than 180 degrees. A common way to identify a concave polygon is to look for a "caved-in" side of the polygon.Convex

A convex polygon contains no interior angles greater than 180 degrees.Decagon

A decagon is a ten sided polygon.Diagonal

A diagonal is a line segment in a polygon that connects nonconsecutive verticesExterior angles

An exterior angle is the angle formed by one side of a polygon and the extension of the adjacent side.Heptagon

A heptagon is a seven sided polygon.Hexagon

A hexagon is a six sided polygon.Interior angles

Interior angles are the angles inside a figure.Nonagon

A nonagon is a nine sided polygon.Octagon

An octagon is an eight sided polygon.Pentagon

A pentagon is a five sided polygon.Polygon

A polygon is a simple closed figure with at least three straight sides.Regular Polygon

A regular polygon is a polygon with all sides the same length and all angles the same measure.Vertices

Vertices are points where line segments intersect.Equilateral

A polygon is equilateral if all of its sides are the same length.### Image Attributions

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Classify different types of polygons by their number of sides.

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Date Created:

Oct 29, 2012
Last Modified:

Aug 16, 2016
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