Polygons

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Polygons
The word polygon is a Greek word. Poly means
many and gon means angles.
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Polygons

• The word polygon means many angles
• A two dimensional object
• A closed figure

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More about Polygons

• Made up of three or more straight line segments
• There are exactly two sides that meet at a vertex
• The sides do not cross each other

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Examples of Polygons
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These are not Polygons
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Terminology

• Side One of the line segments that make up a
  polygon.
• Vertex Point where two sides meet.

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Vertex
Side
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• Interior angle An angle formed by two adjacent
  sides inside the polygon.
• Exterior angle An angle formed by two adjacent
  sides outside the polygon.

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Interior angle
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Let us review
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Types of Polygons

• Equiangular Polygon a polygon in which all of
  the angles are equal
• Equilateral Polygon a polygon in which all of
  the sides are the same length

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• Regular Polygon a polygon where all the angles
  are equal and all of the sides are the same
  length. They are both equilateral and equiangular

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Examples of Regular Polygons