I believe Parrellel lines.....Examples:
Parrallel lines: l l
Perpindicular lines: L
Intercrossing lines (or whatever theyre called) x
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Vertical Angles
No vertical angles are across from each other & adjacent angles are beside but opposite from each other.
Draw to lines intersecting each other. The angles across from each other will be both congruent and adjacent
Vertical angles occur when 2 angles are directly across from each other and are congruent.
Vertically opposite angles, or vert. opp. angles for short.