To work out the circumference of a circle, you multiply the diameter by Pi (approximately 3.141).

en.wikipedia.org/wiki/Circumference

The circumference of a closed curve or circular object is the linear distance
around its edge. The circumference of a circle is of special importance in
geometry and ... The above formula can be rea...

www.mathplanet.com/education/pre-algebra/more-about-equation-and-inequalities/calculating-the-circumference-of-a-circle

Calculating the circumference of a circle. The distance around a rectangle or a
square is as you might remember called the perimeter. The distance around a ...

www.mathgoodies.com/lessons/vol2/circumference.html

Pi is the ratio of the circumference of a circle to its diameter. where circumference
is circumference and diameter is diameter. You can test this formula at home ...

www.mathgoodies.com/calculators/circumference-calculator.html

Our circumference calculator lets you find the circumference of a circle after you
enter its radius. For in-depth instruction on the circumference of a circle, try our ...

www.wikihow.com/Calculate-the-Circumference-of-a-Circle

Write down the formula for finding the circumference of a circle using the
diameter. The formula is simply this: C = πd. In this equation, "C" represents the ...

www.khanacademy.org/math/basic-geo/basic-geo-area-and-perimeter/area-circumference-circle/v/circumference-from-area

Learn how to find the circumference, the distance around a circle, when given the
area.

www.virtualnerd.com/tutorials/?id=PreAlg_11_01_0010

Then you can use the formula for the circumference of a circle to get the answer!
Just plug the value for the diameter into the formula and solve. This tutorial ...

www.reference.com/math/formula-circumference-circle-7e508134800bdd34

The formula for circumference of a circle is 2πr, where “r” is the radius of the circle
and the value of π is approximately 22/7 or 3.14. The circumference of a circle ...

www.aaamath.com/geo612x4.htm

Calculating the Circumference of a Circle. The circumference of a circle is the
distance around the outside of the circle. It could be called the perimeter of the ...