IGO 2020 I4
- Intermediate
Triangle is given. An arbitrary circle with center , passing through and , intersects the sides and at and , respectively. Let be a point such that triangle is similar to triangle (with the same order) and the points and lie on the same side of the line . Similarly, let be a point such that triangle is similar to triangle (with the same order) and the points and lie on the same side of the line . Prove that the line passes through the orthocenter of the triangle .
Proposed by Nguyen Van Linh - Vietnam
Dataset text AI-MO AoPS. Quoted with source.
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