diameter = 12.56/pi
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The ratio of the circumference of a circle to its diameter is Pi. (3.14159)
The circumference of a 6 cm diameter circle is: about 18.85 cm. You can easily do this calculation for other circles by multiplying the diameter by Pi (about 3.1416).
The circumference of a 13.5 diameter circle is: 42.41(diameter x pi = circumference).
The circumference of a circle with a diameter of 55 mm is: 172.8 mm
Given the circumference, divide the circumference by pi (3.1416) to give the diameter of the circle, then divide by 2 to find the radius (half of the diameter).Since C = (pi) D and D = 2r, then r = C/2piSee related links for more help with circles.