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9.12: Polygon Classification

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

TermDefinition
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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Difficulty Level:
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Date Created:
Oct 29, 2012
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Mar 17, 2017
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MAT.GEO.140.L.3