# Complementary & supplementary angles

3 videos
2 skills
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!

### Complementary & supplementary angles

VIDEO 8:31 minutes
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.

### Complementary & supplementary angles

PRACTICE PROBLEMS
Use your knowledge about complementary and supplementary angles to find missing angles.

### Equation practice with complementary angles

VIDEO 2:33 minutes
Given the algebraic expressions that represent a pair of complementary angles, Sal forms and solves an equation.

### Equation practice with supplementary angles

VIDEO 2:37 minutes
Given the algebraic expressions that represent a pair of supplementary angles, Sal forms and solves an equation.

### Equation practice with angle addition

PRACTICE PROBLEMS
Given the sum of a pair of angles and the algebraic expressions that represent them, form and solve an equation.