The radius is 72 inches.
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A circle with a radius of 6 feet has a circumference of 37.7 feet.
12 feet. The diameter of a circle is twice its radius.
37.7 feet
The area of a circle is pi.r2 where pi=3.14159... and r=the radius of the circle. So assuming the dimension of 6' given is for the diameter, (giving a radius of 3',) the calculation is: 3.14159x32=3.14159x9=28.27square feet
I believe 8 feet 6 inch radius and 8 feet 6 inch is 8.5 feet Area of circle is pi x radius x radius = pi x 8.5 x 8.5 = 226.98 square feet