Polygon - a closed figure with straight sides; starts and ends at the same point, Congruent - the same shape and size , Triangle - a polygon with 3 sides, Quadrilateral - a polygon with 4 sides, Pentagon - a polygon with 5 sides, Hexagon - a polygon with 6 sides, Heptagon - a polygon with 7 sides, Octagon - a polygon with 8 sides, Nonagon - a polygon with 9 sides, decagon - a polygon with 10 sides,

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