The diameter should be 7m.
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Diameter. distasnce from center to edge is radius length around is circumfrance
To find the circumference of a circle, you have to multiply Pi and the Diameter. This means that to work out the answer you multiply Pi by 1.25. This equals 3.92699081, which rounded equals 3.93 (2dp) - the circumference of a circle with a 1.25 diameter.
Divide the circumference by pi.
The radius is half of the diameter of a circle.
Diameter of a circle = circumference/pi