Vertical Angles: Definition, illustrated examples, and an ...
Diagram 1. m ∠ x in digram 1 is 157 ∘ since its vertical angle is 157 ∘. Picture 1. Picture 2. In Picture 2, ∠ 1 and ∠ 2 are vertical angles. Likewise, ∠ A and ∠ B are vertical. Vertical angles are always congruent (have the same measure). Picture 3. Picture 3 is another picture of vertical angles.
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