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.

- Vertical angles
- Complementary angles
- Supplementary angles
- Linear pair
- Adjacent angles
- Corresponding angles
- Alternate interior angles
- Alternate exterior angles
- Interior angles of a transversal
- Exterior angles of a transversal

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