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McGraw Hill Integrated II, 2012

MH

McGraw Hill Integrated II, 2012 View details

2. Parallelograms

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Exercise 12 Page 489

Recall the theorem which states that if a quadrilateral is a parallelogram, then its opposite angles are congruent.

128^(∘)

Practice makes perfect

Let's find m∠ S.

Notice that the angles ∠ Q and ∠ S are opposite angles. Recall the following theorem.

Parallelogram Opposite Angles Theorem
If a quadrilateral is a parallelogram, then the opposite angles are congruent.

Therefore, the following angles are congruent. m∠ S= m∠ Q ⇒ m∠ S= 128^(∘)

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Exercises p.489-493