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 use rounding to estimate sums.
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How To: Determine the age of a fossil using carbon14

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

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How To: Find the area of a parallelogram using geometry
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