15.7ft
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A circle with a radius of 5 feet has a circumference of 31.4 feet.
circumference = 2*pi*5 feet
If the circle is five feet across - that is the diameter.
2.52 feet if you mean a 5 foot area 1.59 feet if you mean a 5 foot circumference
The diameter will be: 15.5/pi = 5 feet rounded