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

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

How To: Do long division without a calculator

How To: Find a number given Its percent

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

How To: Find a slope of a line parallel/perpendicular to it

How To: Find the Percent Given Two Numbers

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

How To: Calculate the area of a parallelogram

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

How To: Calculate percent composition for chemistry

How To: Write a slopeintercept equation given an XY table

How To: Find Leg Lengths and Hypotenuse of a 45 45 90 Triangle

How To: Identify characteristics of a sample during a survey

How To: Factor a trinomial with negative leading coefficient

How To: Calculate probability in "at least one" problems

How To: Calculate the area of complex shapes

How To: Use the Pythagorean Formula to find a missing side

How To: Solve nonlinear systems of equations by graphing

How To: Write a multiplication problem in exponential notation

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

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

How To: Do long division without a calculator

How To: Find a number given Its percent

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

How To: Find a slope of a line parallel/perpendicular to it

How To: Find the Percent Given Two Numbers

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

How To: Calculate the area of a parallelogram

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

How To: Calculate percent composition for chemistry

How To: Write a slopeintercept equation given an XY table

How To: Find Leg Lengths and Hypotenuse of a 45 45 90 Triangle

How To: Identify characteristics of a sample during a survey

How To: Factor a trinomial with negative leading coefficient

How To: Calculate probability in "at least one" problems

How To: Calculate the area of complex shapes

How To: Use the Pythagorean Formula to find a missing side

How To: Solve nonlinear systems of equations by graphing

How To: Write a multiplication problem in exponential notation
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