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

How To: Find the Volume of Composite Figures (Also Called Composite Shapes)

How To: Find the area of irregular shapes

How To: Find the area & perimeter of triangles & squares

How To: Draw a parallelogram given base, angle & altitude

How To: Divide small numbers by big numbers

How To: Calculate Faster Than a Calculator

How To: Convert between diameter and radius

How To: Calculate percent composition for chemistry

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

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

How To: Calculate the height and volume of a pyramid

How To: Find outliers using the Zscore method

How To: Find the vertices of a polygon of constraints

How To: Complete a proof involving angles

How To: Solve circlebased problems in basic geometry

How To: Find the Percent Given Two Numbers

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

How To: Convert Fahrenheit to Celsius with a formula

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