Understanding Parallel Lines and Transversals

Front

Parallel Lines

Back

Lines that never intersect and are equidistant

Front

Transversal

Back

A line that crosses two or more lines

Front

Corresponding Angles

Back

-Angles in matching corners when a transversal crosses parallel lines

-Corresponding Angles are equal

Front

Alternate Interior Angles

Back

-Angles on opposite sides of the transversal, inside the parallel lines

-alternate interior angles are equal

Front

Alternate Exterior Angles

Back

-Angles on opposite sides of the transversal, outside the parallel lines

-alternate exterior angles are equal

Front

Supplementary Angles

Back

Two angles whose sum is 180 degrees

Front

Vertical Angles

Back

Angles opposite each other when two lines cross, always equal

Front

Perpendicular Lines

Back

Lines that intersect to form right angles

Front

Angle Sum of a Triangle

Back

180 degrees