The circumference of a circle with a diameter of 7.2 is 22.62. (rounded)
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Circumference = 72*pi
circumference = diameter * pi. Therefore, diameter = circumference ÷ pi.
The circumference of a circle with a diameter of 1 cm would be 0.31. This is used a lot in math.
72 units x 3.1416 = 226.2 units
Circumference = (pi) x (diameter)Diameter = (circumference)/(pi) = 72/pi feet, exactly.That's the only way to write the exact diameter.It can't be done with numerical digits.