Assuming 30 feet is the diameter, its 94.2ft
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circumference = 30*pi = 94.248 feet rounded to 3 decimal places
The circumference of a 30 circle is: 94.25
If a circle circumference is 30 the radius is: 4.77
The circumference of a circle 30 inches in diameter is 30*pi inches
Circumference (the number I assume you want) = Pi X D C = 3.14 x 30 C = 94.2 There are 94.2 linear feet in a 30 foot diameter circle.