Study Guide and Review
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Recall the Theorem 6.3 which tells us that if a quadrilateral is a parallelogram then its opposite sides are congruent.
18
Notice that AD and BC are opposite sides in our parallelogram. Recall the Theorem 6.3 which tells us that if a quadrilateral is a parallelogram then its opposite sides are congruent. Therefore, the lengths of the opposite sides are equal. AD = BC ⇔ AD = 18