# The Pythagorean Theorem with Variables (Algebra I)

Discover more at www.ck12.org: http://www.ck12.org/algebra/Solving-Equations-Using-the-Pythagorean-Theorem/

Here you’ll learn how to apply the Pythagorean Theorem to find the unknown side lengths of right triangles.

This video demonstrates a sample use of the Pythagorean Theorem with variables.

This is part of CK-12’s Algebra I: Algebra and Geometry Connections. See more at:

1. Graphs of Square Root Functions:
http://www.ck12.org/algebra/Graphs-of-Square-Root-Functions/

2. Shifts of Square Root Functions:
http://www.ck12.org/algebra/Shifts-of-Square-Root-Functions/

3. Raising a Product or Quotient to a Power:
http://www.ck12.org/algebra/Raising-a-Product-or-Quotient-to-a-Power/

7. Equations with Radicals on Both Sides:

8. Pythagorean Theorem and its Converse:
http://www.ck12.org/algebra/Pythagorean-Theorem-and-its-Converse/

9. Solving Equations Using the Pythagorean Theorem:
http://www.ck12.org/algebra/Solving-Equations-Using-the-Pythagorean-Theorem/

10. Applications Using the Pythagorean Theorem:
http://www.ck12.org/algebra/Applications-Using-the-Pythagorean-Theorem/

11. Distance Formula:
http://www.ck12.org/algebra/Distance-Formula/

12. Midpoint Formula:
http://www.ck12.org/algebra/Midpoint-Formula/

Watch the whole series of CK-12’s Algebra I videos: https://www.youtube.com/playlist?list=PLhWx3LZhlpseAnFUUMJDWvwKRe2yM3XH6