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 lines in the same plane that never cross or intersect.
Two segments, rays, or lines that form a 90 degree angle.
Two angles whose measures, when added together, equal 180 degrees.
A line that intersects others.
Two angles that share a common vertex and whose sides form two straight lines.
Interactive Geometric Applets: Relevant Theorems.
This applet illustrates how angle pairs in parallel lines cut by a transversal keep
their condition of congruence, or how they remain supplementary.
Drag point B between points A and C (Left and Right) and observe the values of the angles.
Do alternate interior, alternate exterior, and corresponding angles remain congruent?
Do same side interior, or consecutive interior angles add 180° to be supplementary?
Vocabulary Puzzle Interactive
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