It would probably be pretty wide.
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Circumference = Pi x d: 40 = 3.14 x 40 = 125.6 feet
The circumference of a 12-foot-diameter circle is 37.7 feet.
127.324 ft2
That would be 5026.55 square feet.
Radius: 40/2pi = 6.366197724 Area: pi*6.366197724 squared = 127.324 square feet rounded