Oh, dude, you're hitting me with some math here. So, the circumference of a circle is calculated by multiplying the diameter by pi (π). Since the diameter of a circle is twice the radius, and you've given me the radius (40 mm), I can tell you that the circumference of a 40 mm circle would be approximately 251.2 mm. It's like math, but with a side of sarcasm.
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A circle with a radius of 6 mm has a circumference of 37.7 mm
If the diameter of a circle is 3mm the circumference is: 9.424 mm
Radius of the circle: 6.28/2*pi = 0.999 mm or about 1 mm
C = 2pir (substitute 40pi cm for C) 40pi cm = 2pir (divide by 2pi to both sides) 20 cm = r = 200 mm (since 1 cm = 10 mm)
The radius of a circle whose circumference is 40pi is 20 units.