Find the center (h, k) and radius r of the circle with the given equation. x2 + y2 = 9
A. (h, k) = (0, 0); r = 3
B. (h, k) = (3, 3); r = 9
C. (h, k) = (3, 3); r = 3
D. (h, k) = (0, 0); r = 9
Answer: A
Mathematics
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