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 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 solve problems with the Pythagorean theorem in geometry.
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How To: Find the Percent Given Two Numbers

How To: Calculate Faster Than a Calculator

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

How To: Find a number given Its percent

How To: Calculate the area of a parallelogram

How To: Remember "greater than" & "less than" symbols

How To: Do long division without a calculator

How To: Calculate percent composition for chemistry

How To: Determine the age of a fossil using carbon14

How To: Divide numbers using long division

How To: Find the slope of a line given 2 points with fractions

How To: Find the formula of a piecewise function given a graph

How To: Find a missing side of a triangle, similar to another

How To: Find the Slope Given 2 Ordered Pairs

How To: Solve for the missing ratios or proportions

How To: Convert fractions to percents in two steps

How To: Find percent by mass & percent composition

How To: Find the value of a variable in an algebraic equation

How To: Calculate math without a calculator

How To: Find the volume of a sphere with radius r
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