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: Find the Percent Given Two Numbers

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

How To: Find a number given Its percent

How To: Calculate Faster Than a Calculator

How To: Find the Slope Given 2 Ordered Pairs

How To: Find the slope from a set of points

How To: Find extra points for a parabola (quadractic equation)

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

How To: Convert between diameter and radius

How To: Solve percentages without a calculator

How To: Simplify radicals which are not perfect squares

How To: Calculate the area of a parallelogram

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

How To: Rotate a shape about the origin 90° counterclockwise

How To: Solve problems involving functions in algebra

How To: Factor a trinomial with negative leading coefficient

How To: Write a fraction as a decimal

How To: Determine the age of a fossil using carbon14

How To: Solve math problems on number lines

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

How To: Find the Percent Given Two Numbers

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

How To: Find a number given Its percent

How To: Calculate Faster Than a Calculator

How To: Find the Slope Given 2 Ordered Pairs

How To: Find the slope from a set of points

How To: Find extra points for a parabola (quadractic equation)

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

How To: Convert between diameter and radius

How To: Solve percentages without a calculator

How To: Simplify radicals which are not perfect squares

How To: Calculate the area of a parallelogram

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

How To: Rotate a shape about the origin 90° counterclockwise

How To: Solve problems involving functions in algebra

How To: Factor a trinomial with negative leading coefficient

How To: Write a fraction as a decimal

How To: Determine the age of a fossil using carbon14

How To: Solve math problems on number lines
Be the First to Comment
Share Your Thoughts