# 6.9: Identifying Polygons

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**At Grade**Created by: CK-12Estimated6 minsto complete

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**Practice**Polygon Classification

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Concave

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

Convex

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

Diagonal

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

Exterior angles

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

Interior angles

Interior angles are the angles inside a figure.Irregular Polygon

Irregular Polygon

An irregular polygon is a polygon with non-congruent side lengths.Polygon

Polygon

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

Regular Polygon

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

Vertices

Vertices are points where line segments intersect.Equilateral

Equilateral

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

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Learn to identify polygons.

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Date Created:

Jan 23, 2013
Last Modified:

Mar 28, 2016
Vocabulary

Concave

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

Convex

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

Diagonal

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

Exterior angles

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

Interior angles

Interior angles are the angles inside a figure.Irregular Polygon

Irregular Polygon

An irregular polygon is a polygon with non-congruent side lengths.Polygon

Polygon

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

Regular Polygon

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

Vertices

Vertices are points where line segments intersect.Equilateral

Equilateral

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