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 and sketch the domain of a multivariable function

How To: Find percent by mass & percent composition

How To: Graph an inequality in slopeintercept form

How To: Find the volume of a regular pyramid

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