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McGraw Hill Integrated II, 2012 View details

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Exercise 17 Page 532

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

18

Practice makes perfect

We want to find the length of AD.

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