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McGraw Hill Integrated II, 2012 View details

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Exercise 19 Page 532

Recall the Theorem 6.4 which tells us that if a quadrilateral is a parallelogram then its opposite angles are congruent.

115

Practice makes perfect

We want to find the measure of ∠ BCD in the given parallelogram.

As we can see, the angle measuring 115 and ∠ BCD are opposite angles. Recall the Theorem 6.4 which tells us that if a quadrilateral is a parallelogram then its opposite angles are congruent. Therefore, the measures of these angles are equal. m ∠ BCD = 115