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Which is the equation of a circle with a radius of 3 and a center at (0, 0)

Which is the equation of a circle with a radius of 3 and a center at (0, 0)?

A. x² + y² = 3
B. x² + y² = 6
C. x² + y² = 9
D. (x – 3)² + (y – 3)² = 0
E. (x + 3)² + (y + 3)² = 0




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