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

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

How To: Do long division without a calculator

How To: Find the Percent Given Two Numbers

How To: Convert improper fractions to mixed numbers quickly

How To: Find how many toothpicks will be needed to form the nth figure in a sequence

How To: Calculate percent composition for chemistry

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

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

How To: Find a slope of a straight line with: Ax + By + C = 0

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

How To: Do normal probability calculations on a calculator

How To: Find the area of a circle when you know the diameter

How To: Cancel out in basic algebra

How To: Calculate Faster Than a Calculator

How To: Find a number given Its percent

How To: Write a slopeintercept equation given an XY table

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

How To: Find the area of a parallelogram using geometry

How To: Solve percentages without a calculator
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