circumference divided by pi (about 3.1416) = diameter
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
The equation for determining the circumference of a circle is circumference = pi x diameter. So if the diameter is 5, then the circumference is pi * 5 = 15.71
the circumference of a circle divided by its diameter
Circumference = Pi x Diameter (Pi equals 3.14)
Since the equation for circumference is pi*d then if you double the diameter the circumference will be doubled.
circumference of a circle = diameter*pi or 2*pi*radius
Circumference = Diameter multiplied by Pi Diameter = Circumference divided by pi Radius = Diameter divided by 2.
Circumference ("perimeter") of a circle = (pi) x (diameter of the circle)
c=pi x d c=circumference pi=3.141592654 d=diameter
If the diameter of a circle is 69mm then the circumference is: 216.8mm (diameter x pi = circumference).
To get the circumference of a circle, the equation is pi * diameter. So, in this case, it is 2.5 * pi (3.14), or roughly 7.85. So, the circumference of the circle is about 7.85 inches.