It would be pi x 42 feet
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Circumference = diameter*pi feet
Circumference = 42*pi feet or approximately 131.95 feet.
The formula for circumference is 2 x pi x radius. For a circle of 10 feet, the cirumference would be 62.8 feet. The formula for area is pi x r2. For a circle of 10 feet, the radius would be 314.16 ft.
The circumference of a circle with the diameter of 14 ft is: 44 feet.
The area of a circle with a 13 ft diameter is: 132.7 square feet.