Parallel Lines Cut by a Transversal - Vocabulary

Front

Same Side Interior Angles: Angles that are inside parallel lines on the same side of the transversal; they are supplementary.

Back

True

Front

Alternate Exterior Angles are outside the parallel lines, they are diagonal from each other and are congruent.

Back

True

Front

Formed when two lines intersect, known as "opposite angles"; congruent

Back

Vertical Angles

Front

Same position on the parallel lines in relation to the transversal; Same position on the figure; congruent

Back

Corresponding Angles

Front

Inside the parallel lines; Opposite sides of the transversal; they are diagonal (non adjacent) from each other; congruent

Back

alternate interior angles

Front

Two lines in the same place that never intersect

Back

Parallel

Front

A line that intersects two or more lines

Back

Transversal

Front

Two lines that intersect to form four right angles

Back

Perpendicular

Front

Outside the parallel lines; same side of the transversal; supplementary

Back

Same Side Exterior Angles

Front

Two angles whose sum is 180 degrees

Back

Supplementary