In slow pitch (average), about 96.5 millimeters.
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The circumference of a circle with a diameter of 55 mm is: 172.8 mm
The circumference of a circle with a diameter of 110 mm is 345.58 mm
Circumference of a circle = π × diameter = π × 80 mm = 80π mm ≈ 251 mm
Circumference = pi x diameter 440 = 3.1415 x diameter diameter = 440/3.1415 = 140.06 mm
25.13 mm