A Brief History of Science/The Role of Mathematics in Science Homework
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According to the Pythagorean Theorem, if you know the lengths of two sides of a right triangle, then you can find the length of the third side. In order to use the Pythagorean Theorem, we must have a right triangle.
Our triangle is shown at right with two yellow sides and a red side. It is a right triangle because it has a right angle, and so we can use the Pythagorean Theorem to solve for the length of the red side.