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1. Using it’s concept, it is found that vertical angles add to twice the measure of one of the angles, as they are equal. Hence, to solve for a missing measurement, you must equal the two angles that are vertical.

   What are vertical angles?

   Two angles are called vertical when they are opposite of each other in a vertex, that divides an angle adding to 360º is four parts. Since the vertical angles have equal measures, they add to twice the measure of one of the angles.

   For a missing angle, or a missing variable, you must equal the two angles that are vertical and then solve for the missing angle or variable.

   More can be learned about vertical angles at https://brainly.com/question/14362353

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