| Using a reference point P. Instead of using a brute-force calculation to determine which candidate pixel is closer to the circle, we make use of a reference point P. If P is inside the circle, then the candidate to the right of the last pixel is closer to the true circle. Horizontally, P is halfway between the last pixel, and the candidate to the right. Vertically, P is halfway between the two candidate pixels. What are the coordinates of P?

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