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2012d.00363 Ayoub, Ayoub B. The nine-point circle as locus. Math. Spectrum 44, No. 3, 119-121 (2012). 2012 Applied Probability Trust c/o School of Mathematics and Statistics, University of Sheffield, Sheffield EN G40 G70 plane geometry nine-point-circle locus of a point Summary: It will be shown that the nine-point circle of a triangle is the locus of a point moving, under a certain condition, in the plane of the triangle.