Perpendicular lines.
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Parallel lines cut by a transversal form congruent alternate interior angles.
No, intersecting lines form four pairs of supplementary angles
Not true because supplementary angles add up to 180 degrees and two acute angles would be less than 180 degrees.
Yes. If two intersecting lines form the angles A, B, C and D (in rotational order) then AB, BC, CD and DA are pairs of supplementary angles.
yes