The diameter, or the distance across the circle. So if my diameter was 8, I'd take eight times 3.14 and get... give me a minute... 25.12! (That was done using pencil/notecard) Or, you can find the diameter by dividing the Circumference by Pi.
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It will be the square root of 314, which is about 17.7100451467
Circumference = 314 inches implies radius = 49.97 inches and so area = 7846.02 sq inches (approx).
1 x 314 and 2 x 157
0.6369
78.5