radius= 2 feet
diameter= 4 feet
Formula= pi*4= 12,5663706 feet
To the same accuracy as the one significant figure in the question: 10 feet
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If the lake is a perfect circle the circumference would be 2 pi r, or 2,224.25 feet. Lakes aren't perfect circles so the circumference is probably much larger.
The circumference is 12.57 feet. (radius x 2 x pi = circumference)
C=2(pi)r
Circumference of a circle is: 2*pi*radius or pi*diameter
The circumference of a circle with a radius of 6 feet is about 37.7 feet. (C = r x 2 x Pi)