Thứ Bảy, 13 tháng 9, 2014

49-Concurrent again be a point lie on Nine point circle

Let ABC be a triangle, H is the orthocenter. P be any point on the plane. Nine point circles of \triangle HPA, \triangle HPB, \triangle HPC concurrent at midpoint of HP. Them also concurrent again be a point lie on Nine point circle of the triangle \triangle ABC

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