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The circumference of a circle = pi*diameter. 6 feet 3 inches = 6.25 feet, pi*6.25 = 19.63495408 feet or the circumference of the circle is nearly 20 feet.
Circumference = 30*pi = 94.248 feet rounded to 3 d.p.
The circumference of a circle with a diameter of 6 feet is about 18.85 feet.
The diameter of a circle with a circumference of 29 feet is about: 9.231 feet.
The circumference of a circle with a diameter of 3 feet is 9.4 feet.