Pi is the fixed ratio used to calculate the circumference of the circle You can calculate the circumference of any circle if you know either the radius or diameter. Circles You can use pi to calculate the circumference and area of a circle. Finally you can find the diameter - it is simply double the radius.
A line that is drawn straight through the midpoint of a circle and that has its end points on the circle border is called the diameter d Half of the diameter or the distance from the midpoint to the circle border is called the radius of the circle r.
First he convince you the formula. This tool will calculate the circumference of a circle from the diameter and will convert different measurement units for diameter and circumference. Circles You can use pi to calculate the circumference and area of a circle. C Circle circumference.