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QuadrilateralsQuadrilateral kinds and definitions 

Trapezoid a trapezoid has exactly one pair of parallel sides. 
Parallelogram a quadrilateral whose opposite sides are both parallel and equal in length 
Rectangel a parallelogram with 4 right angles. 
Rhombus a rhombus has four sides that are the same length. 
Square a rhombus with 4 right angles. 
