Understanding Parallel Lines and Transversals

Front

*Front:* Parallel Lines

Back

that never intersect and are equidistant

Front

*Front:* Transversal

Back

line that intersects two or more lines

Front

*Front:* Alternate Interior Angles

Back

on opposite sides of the transversal, inside the parallel lines

Front

*Front:* Alternate Exterior Angles

Back

on opposite sides of the transversal, outside the parallel lines

Front

*Front:* Corresponding Angles

Back

two parallel lines are cut by a transversal, corresponding angles are equal

Front

*Front:* Alternate Interior Angles Theorem

Back

two parallel lines are cut by a transversal, alternate interior angles are equal

Front

*Front:* Alternate Exterior Angles Theorem

Back

two parallel lines are cut by a transversal, alternate exterior angles are equal

Front

*Front:* Consecutive Interior Angles Theorem

Back

two parallel lines are cut by a transversal, consecutive interior angles are supplementary

Front

*Front:* Supplementary Angles

Back

Front

*Front:* Vertical Angles

Back

opposite each other when two lines intersect; always equal