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 rewrite a ratio as a fraction in its simplest form.
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How To: Find the area of a circle when you know the diameter

How To: Convert fractions to percents in two steps

How To: Divide decimals

How To: Find the area of a triangle when given 2 sides & angle

How To: Find a missing side of a triangle, similar to another

How To: Find Leg Lengths and Hypotenuse of a 45 45 90 Triangle

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