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Homework answers / question archive / Your are correct in that statement
Your are correct in that statement.
In a parallelogram, opposite angles have equal lengths, and so in each parallelogram there are two pairs of equal angles. In a parallelogram, the angles add up to 360?. Since there are two pairs of angles and one of each pair is on each side, adjacent angles are supplementary (their sum makes 180?)
The following diagram explains: