Vocabulary
Points that lie on the same straight line are called this.
Collinear
Two angles that share a common vertex and side but have no interior points in common.
Adjacent angles
Two angles whose measures add up to 90°.
complementary angles
Angles that are on the same side of the transversal and in corresponding positions.
corresponding angles
When parallel lines are cut by a transversal, corresponding angles are this.
congruent
Points that lie in the same plane are called this.
Coplanar
Opposite angles formed when two lines intersect.
Vertical angles
Two angles whose measures add up to 180°.
supplementary angles
Angles that are on opposite sides of the transversal and inside the parallel lines.
alternate interior angles
When parallel lines are cut by a transversal, alternate interior angles are this.
congruent
A line that intersects two or more other lines at different points.
Transversal
Two adjacent angles whose non-common sides form a straight line.
Linear pair
Two adjacent angles whose non-common sides form a straight line.
linear pair
Angles that are on opposite sides of the transversal and outside the parallel lines.
alternate exterior angles
When parallel lines are cut by a transversal, consecutive interior angles are this.
supplementary (add to 180°)
Two lines in the same plane that never intersect.
Parallel Lines
If two lines intersect to form a 45° angle, what is the measure of the vertical angle?
45°
If one angle measures 110°, its supplement measures this.
70°
Angles that are on the same side of the transversal and inside the parallel lines.
consecutive interior angles (or same side interior angles
If corresponding angles measure 75°, then alternate interior angles measure this.
75°
The figure formed by two rays that share a common endpoint.
Angle
If one angle in a linear pair measures 130°, what is the measure of its adjacent angle?
50°
The complement of a 78° angle.
12°
The region between two parallel lines is called this.
interior
If one consecutive interior angle measures 120°, the other consecutive interior angle measures this.
60°