Corresponding Angles
These angles occupy corresponding positions in relation to the transversal.
Alternate Interior Angles
angles between 2 lines and on opposite sides of a transversal
Alternate Exterior Angles
Angles that lie outside a pair of lines and on opposite sides of a transversal.
Consecutive Interior Angles
angles that are on the same side of the transversal and inside the two lines
Consecutive Exterior Angles
Pairs of angles formed when a third line (transversal) crosses two other lines. The angles are on the same side of the transversal and outside the other two lines.
Corresponding Angles Postulate
If two parallel lines are cut by a transversal, then the pairs of corresponding angles are congruent.
Alternate Interior Angles Theorem
If two parallel lines are cut by a transversal, then the pairs of alternate interior angles are congruent.
Consecutive Interior Angles Theorem
If two parallel lines are cut by a transversal, then the pairs of consecutive interior angles are supplementary.
Alternate Exterior Angles Theorem
If two parallel lines are cut by a transversal, then the pairs of alternate exterior angles are congruent
Vertical angles
Two nonadjacent angles formed by two intersecting lines