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Equation of a Circle: The standard form for a circle centered at the origin, with an example equation x² + y² = 9.

A diagram illustrating the equation of a circle centered at (0,0) with the formula x² + y² = r², showing a pink circle on a grid with labeled radius and center.

A diagram illustrating the equation of a circle centered at (0,0) with the formula x² + y² = r², showing a pink circle on a grid with labeled radius and center.

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