3.1 Angle Pairs

Angles that are on opposite sides of a transversal and inside the two lines it intersects.

Angles that are in the same position on two parallel lines in relation to a transversal.

Angles that are on the same side of the transversal and inside the two lines.

Angles that are on opposite sides of a transversal and outside the two lines it intersects.

Look for angles that are in the same relative position at each intersection of the transversal with the parallel lines.

They are equal in measure.

They are supplementary, meaning they add up to 180 degrees.

The two lines are parallel.

A line that intersects two or more lines at different points.

By their positions relative to the parallel lines and the transversal: Alternate Interior, Alternate Exterior, Corresponding, Same Side Interior, and Same Side Exterior.