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C = pi*d Remember the circle eq'n

To find 'd' we algebraically rearrange. to

d = C/pi

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Circumference of a circle = diameter*pi

Diameter of a circle = circumference/pi

Q: How do you work out diameter given circumference?

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Given a circle with a diameter of 4, the circumference is: 12.6 (diameter x Pi = circumference).

It is: pi*diameter

Diameter = circumference divided by pi. (3.14159)

Divide the circumference by pi (3.141592......) to get the diameter.

Circumference = diameter*pi

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Divide the cirumference by 3.14

Given a circle with a diameter of 4, the circumference is: 12.6 (diameter x Pi = circumference).

If you only have a given diameter you have to multiply the diameter by Pi (3.142) or 3.14 and then you get the circumference!

It is: pi*diameter

Diameter of a circle = circumference/pi

Diameter = circumference divided by pi. (3.14159)

Divide the circumference by pi (3.141592......) to get the diameter.

Circumference = diameter*pi

If you mean the diameter and radius of a circle given the circumference it is:- diameter = circumference/pi radius = circumference/(2*pi)

Diameter = circumference/pi Radius = circumference/2*pi

Given the diameter of the circle, multiply it by π (approx 3.14159).

The diameter of the circle equals the circumference divided by Pi (3.14159....).