Need help solving problems involving 30°60°90° triangles? You're in luck. 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 work with 30°60°90° right triangles.
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How To: Find the area & perimeter of triangles & squares

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How To: Use the ratio formula to find coordinates of a point

How To: Use ">" (greater than) and "<" (less than) symbols

How To: Do long division with decimals

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