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Diameter = circumference/pi
circumference of a circle = pi * diameter.
you multiply the diameter by pi.
3.14 * Diameter2
The diameter of a circle is directly proportionate to the circumference. You can find the diameter of a circle by dividing the circumference by the value of Pi (3.14) OR you can find the circumference by multiplying Pi by the diameter. it is a line that halves a circle