Circumference = pi x diameter.
So the circumference of a circle with diameter 12 cm = pi x 12 = 37.7 cm (1 decimal place.)
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using the formula circumference=diameter X pi: circumference=diameter X pi circumference/pi=diamter X pi/pi circumference/pi=diameter therefore, diameter=circumference/pi diameter=12mm/3.14 diameter=3.821mm
Diameter of a circle = circumference/pi
A circle with a circumference of 11.25 has a diameter of: 3.581
If a circle has a diameter of 14, the circumference is: 43.98.
The diameter of a circle with a circumference of 18 is: 5.73