you times it by 3.14 but if you get a radius you timesit by 2, then by 3.14
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r=d/2 c=Pi*d 2*r=d c=Pi*2*r where c is the circumference r is the radius and d is the diameter
Divide the known circumference by pi to find the diameter of the circle.
To find the circumference of a circle in rhombus you eat SH*t .
(A=πr
The width, or the length of a circle are its diameter.