two angles in a plane that have a common vertex and a common side but no common interior points
alternate interior angles
the inside angles on opposite diagonal sides of a transversal crossing two parallel lines
alternate exterior angles
the outside angles on opposite diagonal sides of a transversal crossing two parallel lines
the angles that lie in the same position or "match up" when a transversal crosses two parallel lines
a collection of points arranged in a straight path that extends without end in both directions
coplanar lines that never intersect
a line that intersects two or more lines in a plane
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