Todor Zaharinov, The Simson triangle and its properties,
Forum Geometricorum, 17 (2017) 373--381.

Abstract. Let ABC be a triangle and P_1, P_2, P_3 points on its circumscribed circle. The Simson triangle for P_1, P_2, P_3 is the triangle bounded by their Simson lines with respect to triangle ABC. We study some interesting properties of the Simson triangle.

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