Diameter = Circumfrence/pi = 13/pi = 4.14 cm (approx)
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The circumference of a circle if its radius is 13cm is: 81.68 cm
Circumference of the circle: 13*pi = 40.841 cm rounded up to 3 decimal places
Diameter of a circle = circumference/pi
The diameter of a circle with the circumference of 3.25 is: 1.034
If the circumference of a circle is 17.27, the diameter is: 5.5