with your radios, you multiply the times the radios
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Circumference = 2 x pi x radius. If you want an estimate, you can round some of the numbers involved - either the radius, or pi, or both.
Diameter of a circle = circumference/pi
A circle with a circumference of 11.25 has a diameter of: 3.581
The circumference of a circle with a radius of four is: 25.13
The circumference of 5 foot circle is: 15.7