Skip to content / Đến nội dung
ThichHocToan.com

MathNet 2022-part-03 — 197 problems (EN–VI) Question 90

Math Olympiad Vault · MathNet 2022-part-03 — 197 problems (EN–VI)

Question 90

In the scalene triangle $ABC$, let $I$ be the intersection point of the angle bisectors. Prove that the line containing the midline of the triangle parallel to $BC$ intersects the lines $BI$ and $CI$ at points lying on the circle with diameter $[AI]$.