Looking for instructions on how to determine whether two triangles are similar in geometry? 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 determine whether two triangles have the same proportions.
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How To: Do long division without a calculator

How To: Square expressions involving radicals

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

How To: Find the area of an oblique triangle using formulas

How To: Find the Radius of a Circle from Arc Length

How To: Find the area of a rectangle

How To: Clear fractions from linear equations in Algebra

How To: Divide small numbers by big numbers

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How To: Write a slopeintercept equation given an XY table
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