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Albanians Cup in Mathematics 2020-21 2p

  geometry problems from Albanians Cup in Mathematics, with aops links in the names


2020-21


Let ABC be a triangle with its orthocenter H. Circle with diameter AH intersect again the circumcircle of traingle of ABC at point P. Line which pass through H and parallel with AP intersect lines AC, AB at points E, F, respectively. Let X be the intersection point of the lines BE and CF. Prove that line PH bisect the segment AX.

Viktor Ahmeti, Kosovo

Angle bisector at A, altitude from B to CA and altitude of C to AB on a scalene triangle ABC forms a triangle \triangle. Let P and Q points on lines AB and AC, respectively, such that the midpoint of segment PQ is the orthocenter of the triangle \triangle. Prove that the points B, C, P and Q lie on a circle.

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