Circumference = 3.1416 x 12.45cm = 39.11cm (approx)
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Circumference is Pi x Diameter so do Circumference divided by Pi to get the diameter :)
diameter = circumference/pi
circumference = diameter * pi. Therefore, diameter = circumference ÷ pi.
Yes because: circumference/diameter = pi and circumference = pi*diameter
Circumference = pi*diameter So diameter = circumference/pi = 1.59 units