To apply the midpoint method, we define

(a) ?circle(x, y)= x ^2+ y ^2-? r?^2

(b) ?circle(x, y)= x+ y ^2-? r?^2

(c) ?circle(x, y)= x ^2– y ^2-? r?^2

(d) ?circle(x, y)= x^2+ y ^2-? z?^2

This question was addressed to me in an interview for job.

My question comes from Line Filling Algorithms topic in chapter Graphics Primitives of Computer Graphics

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