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MathNet 2016-part-06 — 184 problems (EN–VI) Question 138

Math Olympiad Vault · MathNet 2016-part-06 — 184 problems (EN–VI)

Question 138

Bisector of the angle $\angle ABC$ of the triangle $ABC$ intersects the circumcircle of triangle $ABC$ at the point $K$. Point $N$ belongs to the segment $AB$ and $NK \perp AB$. Let $P$ be a midpoint of the segment $NB$. Consider the line through $P$ that is parallel to $BC$ and intersects line $BK$ at the point $T$. Prove that the line $NT$ passes through the midpoint of the segment $AC$.

(Nagel Igor)

Question illustration