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 Related Terms
 Parallelogram:  A quadrilateral with opposite sides that are parallel.
Quadrilateral: A polygon with 4 sides.
Rectangle: A parallelogram with four right angles.
Square: A quadrilateral that has four right angles and four equal sides.
Rhombus: A parallelogram with four equal sides.
Parallel Lines: Two lines are parallel if they lie in the same plane and they do not intersect.