Need help figuring out how to work with circles in basic geometry? 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 about how to calculate and use the radius, diameter, circumference and area of a circle 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: Find a number given Its percent

How To: Find standard deviation

How To: Calculate Faster Than a Calculator

How To: Convert Fahrenheit to Celsius with a formula

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

How To: Find the x & y intercepts of rational functions

How To: Solve an equation with a radical under a radical

How To: Find the equation of a line given 2 points

How To: Find the volume of a cone quickly

How To: Find the Percent Given Two Numbers

How To: Calculate percent composition for chemistry

How To: Find the coordinate of a point

How To: Find the Slope Given 2 Ordered Pairs

How To: Use a TI89 to calculate nCr

How To: Figure out the domain & range of a piecewise function

How To: Use the ratio formula to find coordinates of a point

How To: Find the volume of a sphere with radius r

How To: Solve rateofchange problems with the chain rule
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