It depends on what information you do have about the circle. For example,
circumference = 2*pi*radius.
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In a circle Pi it the ratio of the circumference to the diameter. That is to say, if C is the cirumference and D is the diamter of any circle, we have: Pi=C/D
Circumference = Pi * DiameterThe 3.14 is an approximation for Pi. So if you are finding the diameter of a circle, then divide the cirumference by 3.14.
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