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.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.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 ...

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.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.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 ...

www.coolmath.com/reference/circles-geometry

Definitions and formulas for the radius of a circle, the diameter of a circle, the
circumference (perimeter) of a circle, the area of a circle, the chord of a circle, arc
...

www.mathopenref.com/circumference.html

Definition and properties of the circumference of a circle. ... Given the radius of a
circle, the circumference can be calculated using the formula. Circumference. =.

www.bbc.co.uk/schools/gcsebitesize/maths/geometry/circlesrev2.shtml

So we can write the formula for the circumference of a circle as: C = πd. However,
the diameter is equal to 2 × radius, (2r), so we can also write this formula as:.