It is never a rectangle but they are both 4 sided quadrilaterals
a parallelogram will never ever be a rhombus
They are sometime congruent because a square is a parallelogram and its sides are congruent and a rectangle is one and its sides aren't congruent.
-- A parallelogram is always a quadrilateral. -- A quadrilateral is sometimes a parallelogram.
A rectangle is never a rhombus. A rhombus does not have right angles, but a rectangle does. Definition: rectangle - a parallelogram having four right angles. rhombus - an equilateral parallelogram Websites: http://dictionary.reference.com/browse/rectangle?s=t http://dictionary.reference.com/browse/rhombus?s=t
sometime actually -A rectangle is a parallelogram with 4 right angles. -A square is a parallelogram with 4 right angles and 4 congruent sides. Congruent sides are the same length.
It is always a parallelogram