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Vertical Angles

Angles opposite one another when two lines intersect.

Adjacent Angles

Angles that are next to each other. They share a vertex and a common side.

Complementary Pairs

Angles that have a sum of 90 degrees.

Supplementary Pairs

Angles that have a sum of 180 degrees.

transversal

A line that intersects two or more lines.

alternate interior angles

Angles that lie within a pair of parallel lines and on opposite sides of a transversal; congruent

alternate exterior angles

lines on different sides of the transversal, but on the outside of the lines cut by the transversal

corresponding angles

Angles that have the same relative positions in geometric figures.