Need to know how discover the area of a triangle or rectangle? 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 find the area and perimeter of rectangles and triangles.
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How To: Remember "greater than" & "less than" symbols

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

How To: Convert between diameter and radius

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

How To: Convert fractions to percents in two steps

How To: Do long division without a calculator

How To: Find the coordinate of a point

How To: Divide small numbers by big numbers

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

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