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polygons 
Geometric plane figures with several sides and a number of equal angles.
regular heptagon
Polygon with seven (hepta = seven) sides and equal angles.
regular pentagon
Polygon with five (penta = five) sides and equal angles.
quadrilateral
Any plane figure with four sides and four angles.
regular hexagon
Polygon with six (hexa = six) sides and equal angles.
parallelogram
Trapezoid whose opposite sides are parallel and of equal length; the sides do not meet at right angles.
