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 fourpart installment from Internet pedagogical superstar Salman Khan's series of free math tutorials, you'll learn how to find the optimal angle at which to launch a projectile.
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How To: Remember "greater than" & "less than" symbols

How To: Do long division without a calculator

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

How To: Find the Percent Given Two Numbers

How To: Calculate Faster Than a Calculator

How To: Find a number given Its percent

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

How To: Write a slopeintercept equation given an XY table

How To: Find the area of a parallelogram using geometry

How To: Isolate a variable

How To: Divide small numbers by big numbers

How To: Find points on yaxis a certain distance from a point

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

How To: Simplify fourth roots

How To: Calculate angles formed between transversals and parallel lines in geometry

How To: Calculate the area of a parallelogram

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

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

How To: Solve for the missing ratios or proportions

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

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

How To: Do long division without a calculator

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

How To: Find the Percent Given Two Numbers

How To: Calculate Faster Than a Calculator

How To: Find a number given Its percent

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

How To: Write a slopeintercept equation given an XY table

How To: Find the area of a parallelogram using geometry

How To: Isolate a variable

How To: Divide small numbers by big numbers

How To: Find points on yaxis a certain distance from a point

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

How To: Simplify fourth roots

How To: Calculate angles formed between transversals and parallel lines in geometry

How To: Calculate the area of a parallelogram

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

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

How To: Solve for the missing ratios or proportions

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