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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