Angle Pairs and Measurements

Vocabulary and definitions from the lecture focused on identifying angle relationships by their position and measure.

Adjacent Angles

Two coplanar angles with the same vertex and a common ray or side between them.

Linear Pair

A pair of adjacent angles whose non common sides are opposite rays (forms a straight line); these angles are supplementary.

Vertical Angles

Two angles whose sides form two pairs of opposite rays or two intersecting lines. Vertical angles are congruent.

Complementary Angles

Two angles whose measures have a sum of $90^{\circ}$. Each angle is called the complement of the other.

Supplementary Angles

Two angles whose measures have a sum of $180^{\circ}$. Each angle is called the supplement of each other.

Complement

The name for each angle in a pair where the sum of their measures is exactly $90^{\circ}$.

Supplement

The name for each angle in a pair where the sum of their measures is exactly $180^{\circ}$.