They are: 2*pi*radius or as diameter*pi
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Pi (π) is calculated as the ratio of a circle's circumference to its diameter. Therefore, the two numbers used to calculate pi are the circumference of the circle and its diameter. This relationship holds true for all circles, making pi a constant approximately equal to 3.14159.
Angular measure of a circle: 2*pi radians. Circumference of a circle with diameter d units: d*pi units
The circumference of a circle is 2*pi*radius or pi*diameter
Here is the two formulas *= pie=3.14 Radius C=r2* Diameter C=d*
The diameter of a circle is the length of a line passing through the center of a circle that connects two points on the circumference. The circumference is the distance around the edge of a circle.