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Polygon Classification

Categories of polygons based on the number of sides.
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Identifying Polygons
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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 vertices
Exterior 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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