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Big Ideas Math Integrated I, 2016 View details

1. Angles of Triangles

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Exercise 31 Page 593

What type of angles are ∠ 1 and ∠ 3?

50^(∘)

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Note that from previous exercises we know that the measure of ∠ 1 is 50^(∘).

From the diagram, we can also see that ∠ 3 and 50^(∘) are vertical angles. By the Vertical Angles Congruence Theorem, we know such angles are congruent. m∠ 3=50^(∘).