Parallel Lines, Transversals and Angles

Transversal

A line that intersects two or more lines

Interior Angles

Angles that are between the two parallel lines

Alternate Interior Angles

Angles between the parallel lines, but on opposite sides of the transversal (make a Z shape)

consecutive (same side) interior angles

Angles between the parallel lines and on the same side of the transversal

Corresponding Angles

Angles in the same relative position with respect to the transversal (elevator angles)

Exterior Angles

Angles on the outsides of the parallel lines

Alternate Exterior Angles

Angles on the outside of the parallel lines and on the opposite side of the transversal

Consecutive "Same Side" Exterior Angles

Angles on the outside of the parallel lines but on the same side of the transversal

Linear Pairs(Supplementary Angles)

Angles next to each other that add up to 180 (make a line)

Same Side Interior Angles Rule

If lines are parallel, then same side interior angles are supplementary(two angles equal to 180 degrees).

Supplementary Angles

Two angles that add to 180 degrees

Complementary Angles

Two angles that add to 90 degrees

Alternate Interior Angles

Angles formed when two lines intersect and the opposite angles are congruent(Equal).

Vertical Angles

Angles formed when two lines intersect and the opposite angles are congruent(Equal).