About 100.53 feet.
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A circle with a radius of 16 inches has a circumference of 100.53 inches.
Assuming 16 feet is the diameter, the formula for finding the circumference of a circle is C=πd. For example, 3.14 times 16 would give you 50.24 feet of circumference. If 16 feet is the radius, the formula is C=2πr.
16ft = 2πr π = 3.142 (a constant) -------- r is the radius 16/2π = r r = 16/6.284 r= 2.54 feet
Circumference = 2*pi*r So 2*pi*r feet = 16*pi feet that is r = 8 feet
radius = 16/(2*pi)