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: Do long division without a calculator

How To: Calculate percent composition for chemistry

How To: Solve problems involving functions in algebra

How To: Find the Radius of a Circle from Arc Length

How To: Convert between diameter and radius

How To: Multiply & Divide Numbers (Basic Elementary Math)

How To: Use a TI89 calculator to graph linear equations

How To: Solve integers and rational numbers

How To: Solve rational equations

How To: Calculate Faster Than a Calculator

How To: Find the Percent Given Two Numbers

How To: Divide small numbers by big numbers

How To: Subtract a mixed number from a proper fraction in basic math

How To: Calculate the area of a parallelogram

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

How To: Find the equation of a circle given: center & tangent

How To: Find the area of a triangle when given 2 sides & angle

How To: Prove a triangle inscribed in a circle is right angled
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