Circumference of a circle = diameter*pi
Diameter of a circle = circumference/pi
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C = pi*d Remember the circle eq'n
To find 'd' we algebraically rearrange. to
d = C/pi
Given a circle with a diameter of 4, the circumference is: 12.6 (diameter x Pi = circumference).
It is: pi*diameter
Diameter = circumference divided by pi. (3.14159)
Circumference = diameter*pi
Divide the circumference by pi (3.141592......) to get the diameter.