Circumference x (degree/360)
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-- Circumference of the circle = (pi) x (radius) -- length of the intercepted arc/circumference = degree measure of the central angle/360 degrees
To find the diameter of a circle when given the circumference, you can use the formula: diameter = circumference / π. In this case, the circumference is 62.83185. So, the diameter would be 62.83185 / π ≈ 20 units.
Circumference = (diameter) multiplied by (pi)
As the relationship between the length and angle given are unclear a graphic explanation can be found at the link below
If the circumference or diameter is given then you can find the radius or simply measure the distance from the centre of the circle to the circumference.