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[[File:lighterstill.jpg]][[File:Circumference200.jpg|right|frame]]
The '''circumference''' is the [[distance]] around a closed curve. Circumference is a special [[perimeter]].
==Circumference of a circle==
The circumference of a [[circle]] is the length around it. The circumference of a circle can be calculated from its [[diameter]] using the [[formula]]:
[[File:Circumference1.jpg]]
Or, substituting the [[radius]] for the diameter:
[[File:Circumference_2.jpg]]
where r is the radius and d is the diameter of the circle, and π (the Greek letter pi) is defined as the [[ratio]] of the circumference of the circle to its diameter (the numerical [[value]] of pi is 3.141 592 653 589 793...).
[[Category: Mathematics]]
The '''circumference''' is the [[distance]] around a closed curve. Circumference is a special [[perimeter]].
==Circumference of a circle==
The circumference of a [[circle]] is the length around it. The circumference of a circle can be calculated from its [[diameter]] using the [[formula]]:
[[File:Circumference1.jpg]]
Or, substituting the [[radius]] for the diameter:
[[File:Circumference_2.jpg]]
where r is the radius and d is the diameter of the circle, and π (the Greek letter pi) is defined as the [[ratio]] of the circumference of the circle to its diameter (the numerical [[value]] of pi is 3.141 592 653 589 793...).
[[Category: Mathematics]]
