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  5. Nine - point circumference in case of an arbitrary triangle

Nine - point circumference in case of an arbitrary triangle

S.V. Gadetskaja
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A proof of a nine-point circumference existence for an obtuse and right triangle is specified
Reference:
Hadetskaia, S.V. (2002), "Okruzhnost deviaty tochek v sluchae proyzvolnoho treuholnyka" [Nine - point circumference in case of an arbitrary triangle], Information Processing Systems, Vol. 1(17), pp. 123-128.