2 x 3.1415926535897 = about 6.283
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Boundry of circle is called circumference.
A 12-inch diameter circle has a circumference of: 37.7
int radius = 2; int output; radius = radius * 2; output = radius * Math.PI; Console.WriteLine(output);
"P I" might refer to the number "pi", which is approximately 3.1416."R" might refer to the radius of a circle. For example, the circumference of a circle is equal to pi x diameter, which is the same as 2 x pi x radius.
You can determine the circumference of a reduction gear box by multiplying its diameter by pi. This is because its outer portion is a circle.