2 times pi times the radius of the cylinder.
Answer:
As above but easier for measuring if you use calipers as
C=πD
Area of the head of the cylinder is A=2πD2
and volume V= 2πD2L when L is the cylinder length
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constant circumfrence circuit cycle coset
Circumfrence=Pi x Diamter=Pi x 2Radius
Pi (3.141...) is used for circles, and circles only. You use it to find the area and circumfrence.
You multiply the diameter by pi, (Approximately 3.14159), so C=pi D.
Circumfrence=diameter X 3.14 (diameter=2 X radius)