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: Find a number given Its percent

How To: Find the Height of a Trapezoid.

How To: Remember "greater than" & "less than" symbols

How To: Find the Percent Given Two Numbers

How To: Solve equations with the order of operations

How To: Calculate percent composition for chemistry

How To: Solve for the missing ratios or proportions

How To: Write a sum/difference of logarithms as a logarithm

How To: Find the Radius of a Circle from Arc Length

How To: Write a logarithm as a sum or difference of logarithms

How To: Find the area of irregular shapes

How To: Find least common multiple in rational expressions

How To: Find a slope of a line parallel/perpendicular to it

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How To: Graph a circle

How To: Solve equations involving square roots
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