Two angles are called __________ if their sum is 180⁰.
Supplementary Angles
Non-coplanar lines that do not intersect and are not parallel.
Skew Lines
Coplanar lines that do not intersect.
Parallel Lines
A three or more coplanar lines that intersect at exactly one point.
Concurrent Lines
Two coplanar lines that have a point in common.
Intersecting Lines
Two angles with a common vertex, a common side, but no common interior points.
Adjacent Angles
Two angles are called __________ if their sum is 90⁰.
Complementary Angles
Formed when two straight lines intersect each other. Their sides form two pairs of opposite rays and their angles are non-adjacent.
Vertical Angles