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Geometry and Trigonometry
Difficulty: Easy
In the figure, two lines intersect at a point. Angle and angle are vertical angles. The measure of angle is . What is the measure of angle ?
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Explanation
Choice A is correct. It’s given that angle and angle are vertical angles, and the measure of angle is . Vertical angles have equal measures. Therefore, the measure of angle is .
Choice B is incorrect. This is the measure of an angle that is supplementary, not congruent, to angle .
Choice C is incorrect. This is the sum of the measures of angle and angle .
Choice D is incorrect and may result from conceptual or calculation errors.