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# Unit 9: Pythagorean theorem

## About this unit

The Pythagorean theorem describes a special relationship between the sides of a right triangle. Even the ancients knew of this relationship. In this topic, we’ll figure out how to use the Pythagorean theorem and prove why it works.### Learn

### Practice

### Learn

### Practice

Identify your areas for growth in these lessons:

Test your understanding of

**Pythagorean theorem**with these %(num)s questions.