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If two lines are cut by a transversal to form pairs of congruent corresponding angles, congruent alternate interior angles, or congruent alternate exterior angles, then the lines are parallel.
Vertical equal opposite angles are formed when lines intersect each other.
It couldn't be falser!
An line that is not perpindicular to the other line makes an acute or obtuse angle Oblique lines are not parallel or perpendicular which would be lines that form acute or obtuse angles at the point of intersection.
Lines that form an X shape create vertical opposite equal angles