is sometimes
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Always.
It is never a rectangle but they are both 4 sided quadrilaterals
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 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
a parallelogram will never ever be a rhombus