Circumference = 2*π*r = 12.566 feet (to 3 dp - five significant figures)
To the same accuracy as the one significant figure in the question: 10 feet
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The radius 1,910 feet.
circumference = 2*pi*5 feet
75 rounded
The circumference of a circle if the radius is 2 feet is: about 12.57 feet.
If the radius of a circle is 8 feet the circumference is about 50.27 feet.