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Q: What is the mathematical equation you generally use to find the circumference of a circle when you know the diameter?

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Diameter = Circumference/pi

It is not clear whether the circumference is 9 feet and you want the radius or diameter, or you have either the radius or diameter - which is 9 ft - and you want the circumference. The formulas are Circumference = 2*pi*r = 2*pi*d where r is the radius, d the diameter, and pi is the mathematical constant approximated by 3.14159

c=pi x d c=circumference pi=3.141592654 d=diameter

circumference of a circle = 2*pi*radius or diameter*pi

A baseball is a sphere, and circumference is for 2D figures..... If you were to turn it into a 2D figure, then the equation would be: Circumference = 2 x 3.14r, or if you have the diameter, C = d x 3.14

Related questions

Circumference ÷ Pi = Diameter

Since the circumference is Pi times the diameter then divide the circumference by Pi (3.14159) to get the diameter

circumference divided by pi (about 3.1416) = diameter

If: circumference = pi*diameter Then: pi = circumference/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

Circumference = Pi x Diameter (Pi equals 3.14)

there is no equation of Pi Circumference divided by diameter

Since the equation for circumference is pi*d then if you double the diameter the circumference will be doubled.

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

Diameter = Circumference/pi

Circumference = Diameter multiplied by Pi Diameter = Circumference divided by pi Radius = Diameter divided by 2.

Generally, Pi is used to represent the rate of change of the circumference of a circle as it's diameter increases. This can be shown using the equation [circumference = Pi * diameter], that is the circumference of a circle is always Pi times larger than it's diameter.

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