Yes and the 2 pairs of equal angles add up to 360 degrees
That is an important theorem in geometry: if two lines intersect to form adjacent congruent angles, then the lines are perpendicular. Those congruent angles would be right angles.
yes, intersecting lines form two pairs of congruent angles
Parallel lines cut by a transversal form congruent alternate interior angles.
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.
Perpendicular lines.
Yes
Yes opposite angles are equal
Yes.
yes
yes
2 pairs
Yes.