## Classifying Pairs of Angles

We can also classify angles based on their relationship to another angle. Vertical angles are congruent, supplementary angles add up to 180 degrees, and complementary angles add up to 90 degrees. Watch this lecture series to see the examples of different angle pairs. Complete the interactive exercises.

### Angles: introduction

Source: Khan Academy, https://www.khanacademy.org/math/cc-seventh-grade-math/cc-7th-geometry

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