Circumference = 2 X Pi X Radius
C = 2 X Pi X 3.5
C = 21.991
C = 22 foot.
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If 7 feet refers to the diameter, multiply that by pi.
The circumference of a 128-foot diameter circle is: 402.12 feet.
The circumference of a six-foot diameter circle is: 18.85 feet.
The circumference of a 4 foot circle is: 12.57 feet(diameter x pi = circumference).
Circumference = pi x r squared: where pi = 3.14159 and r = radius (squared) Circumference = 3.14159 x 7 x 7= 153.938 feet