166.42 ft
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C= pi * D This is the formula for circumference.
Circumference = pi*d = 12 ft so d = 12/pi = 3.82 ft (approx).
circumference of the circle = 4*pi cm
The circumference of a circle with a 30 ft radius is approx 188.5 feet.
Circumference = π*d = 7π = 21.99 ft