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Determine a circle through three points

[Conics] A circle has equation x2+y2+Ax+By+C=0x^2+y^2+Ax+By+C=0. Find its equation if it passes through (3,−1)(3,-1), (−2,4)(-2,4) and (6,8)(6,8). State its centre and radius.

CJC · Lecture · Example 6

Move the known squared-coordinate terms to the right before entering the coefficient system.

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