Lesson Review: Polygons

What is a polygon? A polygon is a closed plane figure bounded by straight sides. Here's some examples of regular polygons (a polygon with all sides and all angles equal) :

The following chart will help you remember how many sides and angles each of these polygons have:

Name	Sides	Angles
Triangle	3	3
Quadrilateral	4	4
Pentagon	5	5
Hexagon	7	7
Heptagon	7	7
Octagon	8	8
Nonagon	9	9
Decagon	10	10

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