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

Question

anonymous · Answer

A. Quadrilateral ABCD is a square.
B. Quadrilateral ABCD is a rhombus.
C. Quadrilateral ABCD is a rectangle.
D. Quadrilateral ABCD is an isosceles trapezoid.

anonymous · Answer

B i think:)

anonymous · Answer

orr a

directrix · Answer

If  adjacent angles are congruent, then those angles are right angles because adjacent angles of a parallelogram are supplementary and opposite angles are congruent. 

Nothing is said about the sides of the parallelogram. 

A parallelogram with 4 right angles is a rectangle.