circumference = pi*diameter or pi = circumference/diameter
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you have to measure the diameter of the coil and then multiply the diamter by pi
area = 9∏mm (approx. 28.26mm) circumference = 6∏mm (approx. 18.84mm)
There is a constant relationship between the radius of a circle and its circumference. This is expressed in a formula.
Because the circumference of any circle divided by its diameter is always equal to pi.
The circumference is ALL the way around the circle, while the radius is only HALF way into the middle of the circle. I'm guessing you meant "What is the relationship between the radius of a circle and its circumference?" Radius is half of the diameter of a circle, circumference is PI times diameter; therefore, the circumference is PI times two times radius.