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In the diagram, lines intersect. If one angle is 87°, what is the vertical angle's measure?
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GPT-5 mini
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87°
Vertical (opposite) angles formed by two intersecting lines are congruent, so the angle opposite the 87° angle is also 87°.
Vertical (opposite) angles formed by two intersecting lines are congruent, so the angle opposite the 87° angle is also 87°.
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