When two lines intersect, adjacent angles are ______ (They add up to 180°) and angles across from each 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 each other are vertical (they're equal).
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