How do U Find the Circumference of a Circle?

The circumference of a circle is found using the formula C = d *PI where C is the circumference, d is the diameter of the circle, and PI is a constant value of 3.14159265… For general everyday calculations,it is usually rounded to 3.14. The accuracy needed for the measurement would determine the number of places to round to for PI. The diameter is the distance across the center of the circle. It is twice, or two times, the radius (the distance from the center of the circle to its edge).