tetragon

1. A four-sided polygon (synset 113901783)
   is a type of: polygon, polygonal shape - a closed plane figure bounded by straight sides
   subtypes:

   • parallelogram - a quadrilateral whose opposite sides are both parallel and equal in length
   • trapezium - a quadrilateral with no parallel sides
   • trapezoid - a quadrilateral with two parallel sides
   same as: quadrangle, quadrilateral

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