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.
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You can do an experiment on several circles of different diameters.
any circles circumference divided by its diameter will equal pi, or 3.14159 approximately
circumference = 2*pi*radius or pi*diameter
diameter = circumference divided by pi = 62.8/3.14 = 20
The diameter of a circle with a circumference of 12 is: about 3.82To to this calculation for other circles, just divide the circumference by Pi (about 3.1416). The result is the diameter.