Types of Angles

Transversal

a line that intersects two or more lines

Alternate Interior Angles

The pairs of angles on opposites sides of transversal but inside the parallel lines. (Interior Angles, Non-Adjacent, and on the opposite sides of the transversal) Always Congruent.

Alternate Exterior Angles

The pair of angles on the opposite sides of the transversal but outside the parallel lines. (Exterior Angles that are on the opposite side of the transversal) Always Congruent.

Corresponding Angles

Angles on the same side of the transversal and in the same position Always Congruent.

Same-Side Exterior

Are outside of the parallel lines and on the same side of the transversal line. Supplementary.

Same-Side Interior (Consecutive Interior Angles)

Are inside of the parallel lines and on the same side of the transversal line. Supplementary.

Vertical Angles

Two angles across/ opposite each other intersecting lines. Always Congruent.

Supplementary Angles (Linear Pair)

Any two angles whose sum is 180°. Always adds up to 180°.

Adjacent Angles

Two angles that are next to each other and share a common side.

Complementary Angles

Any two angles whose sum is 90°.