The description, a 6 foot circle, would normally be understood to mean a circle with a diameter of 6 feet. Circles are most usually measured by their diameter.
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22 ft. The diameter is the measurement of a circle through the center from side to side and is equal to two times the radius.
r=3
r = 6 ft C = ~37.7 ft
37.7 feet
12 feet. The diameter of a circle is twice its radius.