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9.12: Polygon Classification

Difficulty Level: At Grade Created by: CK-12
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Vocabulary

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 vertices

Exterior 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.

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Date Created:
Oct 29, 2012
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Jun 05, 2016
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MAT.GEO.140.L.3