Linear Pair of angles
From Latin: linearis - "belonging to a line"
Definition: Two angles that are adjacent (share a leg) and supplementary (add up to 180°)
Try this Drag the orange dot at M.

In the figure above, the two angles JKM and LKM form a linear pair. They are supplementary because they always add to 180° and because they are adjacent, the two non-common legs form a straight line segment JKL.

Related angle topics

General

Angle Types

Angle relationships