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 demonstrate that a diagonal line drawn from one corner of a rectangle to another will generate two equivalent triangles.
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How To: Remember "greater than" & "less than" symbols

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

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

How To: Find the Percent Given Two Numbers

How To: Calculate math without a calculator

How To: Solve percentages without a calculator

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

How To: Write a logarithm as a sum or difference of logarithms

How To: Graph piecewise defined functions

How To: Do long division without a calculator

How To: Convert Fahrenheit to Celsius with a formula

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

How To: Divide small numbers by big numbers

How To: Calculate percent composition for chemistry

How To: Find a missing coordinate given: coordinate & equation

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

How To: Subtract a mixed number from a proper fraction in basic math

How To: Be a human calculator

How To: Solve problems involving deductive reasoning

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