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The radius of a circle is always half of the distance of the diameter. If you have a 24 mm diameter - then the radius would be 12 mm.
d = 2r = 12 mm
You do not specify if the 8 mm is the circumference, diameter or radius. Please clarify.
The circumference of a circle that is 16 mm in diameter is 50.27 mm
The circumference of a circle with a diameter of 13 mm is: 40.84 mm