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 fourpart installment from Internet pedagogical superstar Salman Khan's series of free math tutorials, you'll learn how to find the optimal angle at which to launch a projectile.
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How To: Find the circumference of a circle quickly

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

How To: Divide small numbers by big numbers

How To: Find extra points for a parabola (quadractic equation)

How To: Calculate Faster Than a Calculator

How To: Convert between diameter and radius

How To: Calculate the area of a parallelogram

How To: Identify characteristics of a sample during a survey

How To: Find the 100th term in a sequence

How To: Find the Slope Given 2 Ordered Pairs

How To: Find the equation of a line given 1 point

How To: Figure out the domain & range of a piecewise function

How To: Solve word problems involving domain and range

How To: Divide decimals

How To: Find the perimeter & area of a complex figure

How To: Find the percentage of a number easily

How To: Find intercepts & use them to graph linear equations

How To: Divide a twodigit number into a threedigit number

How To: Find the circumference of a circle quickly

How To: Isolate a variable

How To: Solve proportions
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