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The diameter of a circle can be found without the circumference using the formula d = 2r. This formula requires that you know the radius of the circle which is half of the diameter. To calculate the diameter you need to multiply the radius by 2. For example if the radius of the circle is 4 then the diameter would be 8 (4 x 2 = 8).

You can also find the diameter of a circle if you know the circumference. To do this use the formula c = d. By rearranging the equation you can calculate the diameter as d = c/. For example if the circumference of the circle is 12.5 the diameter would be 4 (12.5/ = 4).

Q: How do you find the diameter without the circumference?

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diameter = circumference/pi

You cannot find the diameter of something from its circumference unless it is a circle and, in that case, diameter = circumference/pi

Diameter = radius * 2 Circumference = pi * diameter.

diameter*pi = circumference

Diameter = circumference/pi

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Take the circumference divided by pi to find the diameter and divide the diameter by two to find the radius.

Diameter = Circumference/pi

diameter = circumference/pi

You cannot find the diameter of something from its circumference unless it is a circle and, in that case, diameter = circumference/pi

Circumference = Pi * diameter

Divide the circumference by Pi to find the diameter.

Circumference = diameter(pi) so divide the circumference by pi to get the diameter.

Diameter = radius * 2 Circumference = pi * diameter.

Circumference: Diameter x pi (3.1415926535897932384...)

circumference/pi = diameter

diameter*pi = circumference