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When two lines intersect, adjacent angles are ____ (they add up to 180°) and angles across from either other are ____ (they're equal).
supplementary, vertical
acute, obtuse
obtuse, acute
vertical, supplementary
Detailed Explanation
Angles around a line add up to 180°. Angles around a point add up to 360°. When two lines intersect, adjacent angles are supplementary (they add up to 180°) and angles across from either other are vertical (they're equal).
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