​Polygons

• The word polygon means “many angles.” ​Poly = many; gon = angle

• ​They are 2-dimensional shapes.

• ​The sides are straight lines.

• ​Non of the line segments can cross one another

• ​The shape is “closed,” that is, all the lines are connected

Not a polygon

• Not a closed shape.

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• ​Not straight line segments.

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• ​Sides that intersect

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• Regular: all the angles are equal and all the sides are equal.

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Polygons are named according to the number of sides and angles they have.

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For example: a triangle has three sides, a pentagon has five sides, a dodecagon has twelve sides.

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Whatever their shape, all polygons are made up of the same parts:

sides, vertices (connecting points), and angles (inside and outside the shape).