If Quadrilateral QRST is a parallelogram, which is not necessarily true?

a. Opposite angles are congruent. b. The diagonals bisect each other.

c. Angles are four right angles. d. Consecutive angles are supplementary.

3 answers

Hold on here - what is a rectangle? How does it differ from any other kind of parallelogram
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Which statement is true about angles 3 and 5?