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...

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 ⋅ ...

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.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.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.1728.org/diamform.htm

Formulas for Circle Circumference, Circle Area, Sphere Area, Partially Filled
Sphere Area, Partially Filled Sphere Volume, Sphere Volume, Cylinder Area, ...

www.mathsteacher.com.au/year9/ch14_measurement/02_circle/circle.htm

Calculating the circumference of a circle. ... The circumference is the distance
around the circle. The circumference, C, of a circle is given by the formula. where
r ...

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".

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

arc: a curved line that is part of the circumference of a circle. chord: a line
segment within a circle that touches 2 points on the circle. circumference: the
distance ...

xkcd.com/1184/

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