If you're seeing this message, it means we're having trouble loading external resources for Khan Academy.
If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked.
Complementary and supplementary angles
In this tutorial we'll look at the most famous types of angle-pairs--complementary and supplementary angles. This aren't particularly deep concepts, but you'll find they do come in handy!
Let's add some tools to our geometry tool belt. Here's a thorough explanation of complementary and supplementary angles, as well as definitions of adjacent and straight angles.
Given the algebraic expressions that represent a pair of complementary angles, Sal forms and solves an equation.
Given the algebraic expressions that represent a pair of supplementary angles, Sal forms and solves an equation.
Given the sum of a pair of angles and the algebraic expressions that represent them, form and solve an equation.