Polygons by Amy Pihlainen

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Polygonsby Amy Pihlainen
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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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Terms

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

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Terms continued

• 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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Terms continued
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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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Types of Polygons continued

• 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
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Names of Polygons

• Triangle a three sided polygon
• Quadrilateral a four sided polygon. A
  quadrilateral that is a regular polygon is called
  a square.

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Names continued

• Pentagon a five sided polygon
• Hexagon a six sided polygon
• Heptagon a seven sided polygon

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Names continued

• Octagon an eight sided polygon
• Decagon a ten sided polygon
• Dodecagon a twelve sided polygon