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

Circumference - Wikipedia

en.wikipedia.org/wiki/Circumference

The circumference of a closed curve or circular object is the linear distance around its edge. ... Or, equivalently, as the ratio of the circumference to twice the radius. The above formula can be r...

Calculating the circumference of a circle (Pre-Algebra, More about ...

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

The distance around a circle on the other hand is called the circumference (c). ... The circumference of a circle is found using this formula: C = π ⋅ d o r C = 2 π ⋅ ...

Circumference - Math Goodies

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

Circumference of a circle is presented in this interactive lesson from Math ... Another way to write this formula is: Circumference equals Pi times diameter ...

How to Calculate the Circumference of a Circle (with Examples)

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 ...

Circumference of a circle | Area and circumference of circles | Area ...

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.

What is the formula for the circumference of a circle? | Reference.com

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 ...

How Do You Find the Circumference of a Circle if You Know the ...

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! ... diameter; pi; multiply; pi times diameter; solve for circumference of a circle.

Circumference (perimeter) of a circle definition - Math Open Reference

www.mathopenref.com/circumference.html

Definition and properties of the circumference of a circle. ... R is the radius of the circle π is Pi, approximately 3.142. See also Derivation of circumference formula  ...

Perimeter Formulas - Math.com

www.math.com/tables/geometry/perimeter.htm

(pi = pi = 3.141592...) Perimeter Formulas The perimeter of any polygon is the sum of the lengths of all the sides. Note: "ab" means "a" multiplied by "b".