Find the standard equation of the circle with the given radius r and center C.r = 9
C = (7, 0)
A. x2 + (y + 7)2 = 9
B. x2 + (y - 7)2 = 9
C. (x + 7)2 + y2 = 81
D. (x - 7)2 + y2 = 81
Answer: D
Mathematics
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