A circle with a radius of 6 mm has a circumference of 37.7 mm
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The circumference of a circle equals the diameter times pi. The diameter is two times the radius. So a circle with a radius of 6 would have a diameter of 12, and a circumference of 12pi.
The circumference of a circle is 2*pi*r. With r = 3, the circumference is 6 pi.
The radius would be 2.5 mm.
It needs to be more specific. is 6 the diameter or radius of a circle?
Circumference = 2 x pi x radius = 24 pi 2 x radius = 24 ; radius = 12 units