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Polygons
A polygon (Greek for many sides ) is a closed figure drawn in the plane using straight line segments which meet only at their endpoints.
Polygons are named according to their number of sides.
Name
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Number of Sides
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Triangle
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Quadrilateral
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Pentagon
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Hexagon
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Heptagon
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Octagon
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Nonagon
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Decagon
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Hendecagon (or Undecagon, or Unidecagon) |
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Dodecagon
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-gon
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A regular polygon is one in which all interior angles are congruent and all sides are congruent; for example, an equilateral triangle, or a square.