The Pythagorean Theorem and its proof

Learn the basics of the Pythagorean Theorem and how to use it to find the unknown side of a right triangle. I also show a simple geometric proof of the theorem.

See also

Using the Pythagorean Theorem 1: Area of an Isosceles Triangle - a video lesson

Using the Pythagorean Theorem 2: Diagonal of a Square - a video lesson

Using the Pythagorean Theorem 4: perimeter of a trapezoid - a video lesson

Math Mammoth Grade 7 curriculum (pre-algebra)

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