The circumference of a circle is the line that makes up the edge of the circle, such that every point on the line is equidistant from the center. It is different from the diameter because the diameter is a line that pass... More »

The circumference of Earth is 24,901.55 miles at the equator, located at zero degrees latitude and the point at which the planet is the widest. The circumference measures the distance around Earth. Measured around the po... More »

If the radius of the circle is known, the diameter formula is diameter=2R, where R equals the circle's radius. If the circumference of the circle is known, the diameter is found using diameter=C/Pi, where C is the circum... More »

Some mathematical problems that feature pi are the area of a circle, a circle's circumference, arc length and the different surface area and volume formulas for a cone, sphere and cylinder. In mathematics, the ratio betw... More »

To calculate a circle's diameter from its circumference, one should divide the circumference by the constant pi, which is an irrational number approximately equal to 3.14159265358979. More »

If the circumference or the area of a circle is known, pi can be used to find the diameter and the radius of that circle. Likewise, if the radius or diameter is known, pi can be used to find out the circumference or the ... More »

To find the circumference of a circle, multiply the diameter by pi or double the radius times pi. Pi is an unchanging number that rounds off to 3.14. More »