From Ramanujan to calculus cocreator Gottfried Leibniz, many of the world's best and brightest mathematical minds have belonged to autodidacts. And, thanks to the Internet, it's easier than ever to follow in their footsteps. With this installment from Internet pedagogical superstar Salman Khan's series of free math tutorials, you'll learn how to perform a geometric proof of the Pythagorean theorem.
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How To: Evaluate fractions containing variables

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How To: Convert between diameter and radius

How To: Do normal probability calculations on a calculator

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How To: Find the 100th term in a sequence

How To: Round a decimal number to the nearest tenth in basic arithmetic

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