The Circumference from the Area of a Circle calculator computes the circumference of a circle based on the circle's area (A).
INSTRUCTIONS: Choose your preferred area units and enter the following:
Circumference: The calculator returns the circumference (C) in meters. However, this can be automatically converted to other length units via the pull-down menu.
Theis as follows:
`c = 2π·sqrt(A/π)`
A circle is the set of all points equal in distance from a center point. This formula uses a form of the equation for the area of a circle to compute the circumference.
If you know the area you wish to enclose, in a circular fence for example, this formula will tell you the circumference of the circle which is the length of the fence.