In this video, we are going to look at how to find a missing side length of a right triangle by using the Pythagorean Theorem.

**Pythagorean Theorem**

where *a* and *b* are lengths of legs of the right triangle,

and *c* is the length of the hypotenuse.

**For example:**

To solve the following equation:

Substitute the variables where *3* replaces *a* and *4* replaces *b*

Solve for and

Add the *9* and the *16* together, leaving us with:

Find the square roots on both sides

Leaving us with:

So the hypotenuse equals to *5*

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