# Pre-Algebra - Square Roots and the Pythagorean Theorem

Finding square roots is one of those math ideas that is fairly simple. Basically, to square a number, you just multiply it by itself. The square root is the number you multiplied by itself. Sometimes it's an easy calculation: the square root of 25 is 5. Other times, as Prof. Burger demonstrates, it's a bit trickier as with the square root of 30 since there is no whole number that equals 30 when squared.

Once you've got the basics of square roots, Prof. Burger moves on to the Pythagorean Theorem, one of the most important theorems in math. Not only will you learn the theorem, but also why it is true! Then it's on to applying the theorem as it is demonstrated in several examples, including how to reverse it to prove a triangle is a right triangle!

Today's free Pre-Algebra video has a total of 4 lectures in it covering Square Roots and the Pythagorean Theorem. This will be plenty to help you thoroughly understand the subject. Just make sure you click on the forward button directly to the left of the time stamp to move to the next lecture.