It is approx 3.18 metres.
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Circumference is Pi x Diameter so do Circumference divided by Pi to get the diameter :)
The circumference is pi x diameter, or 2 x pi x radius. In this case, 2 x pi x 10, approximately 20 x 3.14 = 60.28 meters.
diameter = circumference/pi
Diameter = 1.5/pi = 0.4774648293 of an inch
circumference = diameter * pi. Therefore, diameter = circumference ÷ pi.