|rhombus rectangle trapezium See also trapezoid a quadrilateral whose opposite sides are parallel and equal in length|
|[C16: via French from Late Latin, from Greek parallēlogrammon, from parallēlos|
|parallelogram (pār'ə-lěl'ə-grām') Pronunciation Key
A four-sided plane figure with opposite sides parallel. Rhombuses and rectangles are parallelograms.