Angles Relationships Formed by a Transversal

Corresponding Angles

Corresponding angles are matching angles that are congruent.

Corresponding Angles

Corresponding angles congruent angles that are in matching corners.

Linear Pairs

Linear pairs are supplementary angles that are adjacent angles formed by intersecting lines.

Same-Side Exterior Angles

Same-side exterior angles are supplementary angles outside the parallel lines on the same-side of the transversal.

Same Side Interior Angles

Same-side interior angles are inside the parallel lines on the same-side of the transversal and are supplementary.

Same-Side Interior Angles

Same-side interior angles are supplementary angles inside the parallel lines on the same-side of the transversal.

Transversal

A line that crosses two or more (usually parallel) lines.

Alternate Exterior Angles

Alternate exterior angles are congruent angles outside the parallel lines on opposite sides of the transversal.

Alternate Exterior Angles

Alternate exterior angles are outside the parallel lines on opposite sides of the transversal and are congruent.

Alternate Interior Angles

Alternate interior angles are congruent angles inside the parallel lines on opposite sides of the transversal.

Alternate Interior Angles

Alternate interior angles are inside the parallel lines on opposite sides of the transversal and are congruent.

Supplementary Angles

Two angles whose measures add to 180⁰.

Complimentary Angles

Two angles whose measures add to 90°.

Vertical Pairs

Vertical angles are congruent angles opposite each other when two lines cross.