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Alternate interior angles
interior angles, non-adjacent and on opposite sides of the transversal - congruent if they lie on parallel lines cut by a transversal

Alternate exterior angles
exterior angles, non-adjacent and on opposite sides of the transversal - congruent if they lie on parallel lines cut by a transversal

Corresponding angles
angles on the same side of the transversal and in the same position - Congruent if they lie on parallel lines cut by a transversal
consecutive (same side) exterior angles
exterior angles that are on the same side of the transversal - supplementary if they lie on parallel lines cut by a transversal
transversal
a line that intersects two or more lines
skew lines
non-coplanar lines that do not intersect
consecutive (same-side) interior angles
interior angles that lie on the same side of the transversal - supplementary if they lie on parallel lines cut by a transversal
parallel lines
lines in the same plane that never intersect
linear pair
a pair of adjacent angles whose noncommon sides form a straight line
vertical angles
a pair of opposite congruent angles formed by intersecting lines