It is (x + 7)2 + (y + 2)2 = 42
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It is (x - 7)^2 + (y - 4)^2 = 4
The radius is 72 inches.
The radius of any circle is half the diameter.
72 foot
What aspect of the circle is 72? You will get a different answer depending on whether 72 refers to the diameter, circumference or area.