To find the diameter, divide the circumference by pi
75 ÷ 3.14159 ≈ 23.87 mm
Then divide that by 2 to find the radius
23.87 ÷ 2 = 11.935 mm
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If a circle circumference is 30 the radius is: 4.77
The radius of a circle with a circumference of 59 is: 9.39
The circumference of a circle with a 2pi radius is: 39.58
The radius of a circle if its circumference is 42 is about 6.68
The circumference of a circle of radius 5 is about 31.42