Circumference Calculator
Last updated: July 17, 2022
Definition of circumference
Circumference is the perimeter of a circle or ellipse.
Parts of a Circle
- r – Radius
- D – diameter
- C – Circumference
- A – Area
Formula for circumference
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If given Radius of a circle (r):
{C = 2\pi r}
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If given Diameter of a circle (D):
{C = \pi D}
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If given Area of a circle (A):
{C = 2\pi \sqrt{\dfrac{A}{\pi}}}
Where π is a constant approximately equal to 3.14159.
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