Alternate exterior angles
Exterior angles on alternate sides of the transversal (not on the same parallel line)
Alternate interior angles
Interior angles on alternate sides of the transversal (not on the same parallel line)
Two positive angles that when added give 90 degrees.
Any pair of angles in similar locations with respect to a transversal
Two or more coplanar lines that have no points in common or are identical.
Two segments, rays, or lines that form a 90 degree angle.
A statement assumed to be true without proof.
A sequence of justified conclusions used to prove the validity of an if-then statement.
Two positive angles whose measures add to 180 degrees, a straight line.
A theorem in mathematics is a proven fact. A theorem about polygon must be true for every polygon; there can be no exceptions. An idea which works in several different cases is not enough.
A line that intersects others.
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