Angles A and B are vertical. If the measure of angle A is seventy-nine degrees, what is the measure of angle B?
2 answers:
Vertical angles<span> are angles opposite each other where two lines cross. They are called this because they share a vertex.
For instance, in the attached diagram that I drew, </span>∠CEA and ∠BED are vertical angles. You may be able to tell visually that they are also congruent.
If, as given, ∠B and ∠A are vertical, and m∠A = 79°, then since ∠A <span>≅ </span>∠B, m∠B = 79°.
For instance, in the attached diagram that I drew, </span>∠CEA and ∠BED are vertical angles. You may be able to tell visually that they are also congruent.
If, as given, ∠B and ∠A are vertical, and m∠A = 79°, then since ∠A <span>≅ </span>∠B, m∠B = 79°.
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