If you know the radius, double that to get diameter. If you have neither radius or diameter, then measure around the outside.
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To find the circumference of a circle, you need only know the radius or diameter of the circle. The circumference of a circle is calculated as 2 x Pi x radius OR Pi x diameter. Pi is approximately 3.1415926.
You are correct that the circumference of a circle = pi * diameter. One possibility is that pi need to have a certain precision to have an answer to match your known solution. Without knowing more about your problem and the supposed answer, I cannot help you further. P.S. pi = 3.1415926535897932384626433832795... =======================
To find the linear feet in a given diameter, you need to know the circumference (or perimeter) of the object. The formula to calculate the circumference is circumference = π × diameter. Without the circumference, it is not possible to determine the linear feet.
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).