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The distance around a circle is called the circumference.

Sources:

en.wikipedia.org/wiki/Circumference

The circumference of a closed curve or circular object is the linear distance
around its edge. The

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

Learn how to find the

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

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

Our circumference calculator lets you find the

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

The distance around a rectangle or a square is as you might remember called the

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

Write down the formula for finding the

www.aaamath.com/geo612x4.htm

An interactive math lesson to calculate the

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

Then you can use the formula for the

www.mathopenref.com/circumference.html

Definition and properties of the