Well,
the circumference of a circle is its diameter x pi (for the purposes of this, we will consider pi to be 3.1415) so that the circumference can be expressed as 4pi or as 12.566.
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Given a circle with a diameter of 4, the circumference is: 12.6 (diameter x Pi = circumference).
The circumference of a circle is the diameter times pi (3.141) so therefore a 4 meter circumference circle has a diameter of 1.273 m E.g. 4 / 3.141 = 1.273
The circumference of a 4 foot circle is: 12.57 feet(diameter x pi = circumference).
the equation for the circumference of a circle is 2*radius*pi, or since the radius is half of the diameter 2*radius=diameter, we can simplify the equation to the circumference of a circle=diameter*pi
Circumference of circle: 4 times pi in inches