Doubling the radius will give the diameter and times this by pi will give the circumference of the circle.
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Of a circle: divide the length of the circumference by the value of Pi (about 3.14159). The answer is the diameter. Half of the diameter is the radius
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