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.
 Hot
 Latest

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: Find the Percent Given Two Numbers

How To: Find a number given Its percent

How To: Graph a linear equation in 3 different ways

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

How To: Simplify fractions with variables in basic algebra

How To: Calculate Faster Than a Calculator

How To: Divide small numbers by big numbers

How To: Convert Fahrenheit to Celsius with a formula

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

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

How To: Learn Calculus in 20 minutes

How To: Write a slopeintercept equation given an XY table

How To: Derive the area of a circle

How To: Solve an equation with fractional powers

How To: Calculate percentages in your head

How To: Find the 100th term in a sequence

How To: Normalize a data set into another scale

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: Find the Percent Given Two Numbers

How To: Find a number given Its percent

How To: Graph a linear equation in 3 different ways

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

How To: Simplify fractions with variables in basic algebra

How To: Calculate Faster Than a Calculator

How To: Divide small numbers by big numbers

How To: Convert Fahrenheit to Celsius with a formula

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

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

How To: Learn Calculus in 20 minutes

How To: Write a slopeintercept equation given an XY table

How To: Derive the area of a circle

How To: Solve an equation with fractional powers

How To: Calculate percentages in your head

How To: Find the 100th term in a sequence

How To: Normalize a data set into another scale
Be the First to Comment
Share Your Thoughts