Equation of a Circle: Given the coordinates of the center (h, k) and radius r, the equation of a circle is (x - h)² + (y - k)² = r².
Diagram showing the equation of a circle with center (h, k) and radius r, illustrated on a coordinate grid with a circle centered at (2, 3) and the formula (x - h)² + (y - k)² = r².
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