Linear Pair. two adjacent angles whose non-common sides are opposite rays. (if two adjacent angles have non-common sides that form opposite rays, then they.
A ray has one endpoint and extends indefinitely in one direction. A pair of opposite rays are two rays that have the 'same endpoint and extend in opposite.
Angle, Two different rays that have the same initial point. Acute, An angle Vertical angles, Two angles whose sides form two pairs of opposite rays. Linear pair.