The radius of a circle with a circumference of 13 feet is: 2.069 feet.
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radius in feet = 13/(2*pi)
r = ~2.07 feet
A circle with a radius of 8 inches has a circumference of 50.27 inches.
The circumference of a circle with a 13-inch radius is: 81.68 inches (r x 2 x pi = circumference).
It is: 2*pi*13 cm