Question at-the
- At the intersection of the 2 lines, the angles are labeled clockwise from left as follows:
- Left: 1
- Top: unlabeled
- Right: 2
- Bottom: unlabeled
- A note indies the figure is not drawn to scale.
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 ?
At the intersection of the 2 lines, the angles are labeled clockwise from left as follows:
Easy-difficulty · SAT Math · Lines, Angles, and Triangles — Angle relationships (parallel lines). Read the question above, select your answer, and check the full explanation below to understand exactly why the correct choice works.
Answer 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.
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