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McGraw Hill Integrated II, 2012 View details

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Exercise 18 Page 532

Recall the Theorem 6.3 which tells us that if a quadrilateral is a parallelogram then its opposite sides are congruent.

12

Practice makes perfect

We want to find the length of AB in the given parallelogram.

Notice that AB and CD 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. AB = CD ⇔ AB = 12