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
A circle with a radius of 6 feet has a circumference of 37.7 feet.
A circle with a radius of 100 feet has a circumference of 628.32 feet.