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Chapter 3. Trigonometry 101 > The Pythagorean Theorem

The Pythagorean Theorem

Named after the Greek philosopher Pythagoras, the Pythagorean theorem states a simple but powerful relationship between the sides of a right triangle: The square of the hypotenuse of a right triangle is equal to the sum of the squares of the remaining two sides.

So, given a triangle with sides of length a, b, and c (where c is the hypotenuse), the theorem reads a2 + b2 = c2.


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