C = 2πr
C = 2π * 6
C = 12π or 37.6991 feet.
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It is 3.8 feet, approx.
approximately 37.7 feet
The circumference C is equal to [2 x pi x radius] or [pi x diameter]In the example, the circumference is 12 pi = 12 x 3.1416 = about 38 feet (37.70 feet)
circumference = diameter x pi where pi is a constant = 3.14159 circumference = 12 x 3.14159 = 37.69908 feetPlease see the article on finding the circumference of a circle:How_do_you_find_the_circumference_of_a_circle
For the small circle of diameter 6, the circumference is 18.84.