(A=πr
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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 .
The width, or the length of a circle are its diameter.
The radius of a circle is half its diameter (the measure of the circle from one side across to the other).
The unit circle is a circle that can be used to find trigonometric functions. The equation of the unit circle is x^2 + y^2 = 1. So it is any circle with radius 1.