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Answered 2012-04-04 13:41:56
To work out the diameter of a circle with only the circumference, you need to divide the circumference by pi ≈ 3.1416.

1/pi ≈ 0.31831


Pi is a so far unique number with an endless number of decimals. It is heavily related to math tied to circles and is used in a number of equations involving circles.

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Circumference of a circle = diameter*pi Diameter of a circle = circumference/pi

Divide the circumference by 3.14159265 (3.14 for rough approximation) to find the diameter of a circle.

It is the ratio of the circumference (C) and the diameter (D) of a circle. Using pi and the diameter of a circle, you can work out the circumference.

The value of pi = circumference/diameter

it uses to find out thearea and circumference of circle. diameter=2*radius

16.55cm - If you want to work it out, you will need to divide the circumference by pi.

diameter X pi = circumference What you call edge is usually called circumference. pi = 3.1416

Work it out the circumfrance of a circle is pie x the diameter!

The circumference of a circle is pi times the diameter. If you want a third of that, divide by 3. (Pi is approximately 3.14) Then to get the perimeter add the diameter to the circumference of the 1/3 of the circle.

To find the circumference of a circle, you have to multiply Pi and the Diameter. This means that to work out the answer you multiply Pi by 1.25. This equals 3.92699081, which rounded equals 3.93 (2dp) - the circumference of a circle with a 1.25 diameter.

The circumference of a circle is (pi) x (diameter), or (2 pi) x (radius).

The circumference of any circle divided by its diameter is always equal to pi. With this information we can work out various properties of the circle such as its circumference or its area.

To work out the circumference of a circle, you need to do pi multiplied by the diameter. The diameter is the distance from one end to the other. Pi = 22/7 or 3.141...

The formula for working out the circumference of a circle is:pi (3.14) x diameterORpi (3.14) x 2 x radiusThe diameter of a circle is the length of a line that goes right through the middle of the circle and touches on both sides.The radius of a circle is half of the diameter.

Twice the radius times pi or the diameter times pi

multiply pi times diameter and divide by 2!

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

The Circumference (C) of a circle will ALWAYS be 3.1415926 times its Diameter (D). This irrational number (which goes on forever) is called "pi". C = pi x D This will work for any circle, because as the circle gets bigger or smaller, so does the circumference by the same scale.

To find the circumference (distance around) of a circle, use the formula pi x d (d=diameter)

The circumference C = diameter d times pi. C = 9 times 3.14159 = 28.274334 for a circle of 9 units You have only to choose for the circumference and for the diameter the same unit. Then it work for meters, centimeters, inches, and marsian bobugs,

Circumference = pi*diameter or 2*pi*radius

The perimeter of a full circle (circumference) is "pi" times the diameter. So the perimeter of a semi-circle will be half that; Perimeter = (pi/2) x (diameter).

Diameter- 128 / pi = 40.7436654 or 41 feet, I had this on my homework, do you know how to show the work though? Tricky.

The formula for size and circumference is pi x diameter. Let's work that backwards. If the circumference is 20, divide that by pi (3.14) that will give you the diameter. We know that the radius is half of the diameter, so take the answer you just got, divide by 2, and that will be the radius.

The formula for the area of a circle is pi(r2) 3.14xr2 The circumference is pi(diameter) and the radius (r) is half of the diameter (d) Example...if the circumference is 25.12in then the area is 50.24in Work being... Circumference = 3.14(d)=25.12 To find the diameter you have to get d by itself... Divide 3.14 to both sides to do that 3.14/3.14(d)=25.12/3.14 d=8 Now that you have the diameter you know that the radius is half of the diameter so radius (r)=4 Therefore the area of the circle is 3.14(42)=50.24in

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