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Angles opposite one another when two lines intersect.
Angles that are next to each other. They share a vertex and a common side.
Angles that have a sum of 90 degrees.
Angles that have a sum of 180 degrees.
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
Angles that have the same relative positions in geometric figures.