25.13 mm
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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
37.68 MM
diameter = 110.6/pi = 35.20507341 mm