Khan Academy: Angles: Identifying Complementary and Supplementary Angles

Right angles, acute angles, obtuse angles, central angles, inscribed angles: how many types of angles are there? Learners first investigate definitions of inscribed angles, central angles, and intercepted arcs. The majority of the...

Complement the angle definition. The resource, a video within a basic geometry playlist, introduces the definition of complementary angles. Using the definition, the presentation finds complements of given angles.

Supplement your knowledge of angles. Part of a playlist exploring geometry concepts, an interesting video introduces the definition of supplementary angles. Using the definition, the presentation shows how to find the supplement to a...

Shows how to identify complementary and supplementary angles in a diagram. [2:36]

How to identify and name rays. [5:40]

Learn what the terms angle of elevation and angle of depression mean. The words may be big but their meaning is pretty basic!

Sal finds a linear pair, vertical angles, and adjacent angles from a diagram.

Learning module with desciptions, examples and practice problems about all angle types.

Describes complementary and supplementary angles. Explains how to use properties of complementary and supplementary angles to solve for missing angle measures. Introduces idea that vertical angles (opposite angles) are congruent. [9:05]

Basics of complementary, supplementary, adjacent and straight angles. Also touching on what it means to be perpendicular.