Looking for instructions on how to determine whether two triangles are similar in geometry? 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 (or just finish your homework or study for that next big test). With this installment from Internet pedagogical superstar Salman Khan's series of free math tutorials, you'll learn how to determine whether two triangles have the same proportions.
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How To: Calculate percent composition for chemistry

How To: Solve problems involving functions in algebra

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

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How To: Use a TI89 calculator to graph linear equations

How To: Solve integers and rational numbers

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