Posted by **y.m.** on Tuesday, June 8, 2010 at 10:52am.

Quadrilateral PQRS is a parallelogram. If adjacent angles are congruent, which statement must be true?

A. PQRS is a square.

B. PQRS is a rectangle.

C. PQRS is an isosceles trapezoid.

D. PQRS is a rhombus

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