Schmall, Charles Nelson. [from old catalog] · New York, D. Van Nostrand company · leaf 103
(x - hf -^{y- k)\... (^ - iz)2 + (j^ - kf = r2^ is the required equation of the Fig. 79. circle. 54. Special positions of center. — (1) If the center is at the origin^ h =^ 0, k = 0, X and the above equation becomes :s2 + 72 = 2-2.
Geometry, Analytic
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