Problem

Source: ELMO Shortlist 2010, G3

Tags: geometry, incenter, circumcircle, conics, parabola, geometry proposed



A circle $\omega$ not passing through any vertex of $\triangle ABC$ intersects each of the segments $AB$, $BC$, $CA$ in 2 distinct points. Prove that the incenter of $\triangle ABC$ lies inside $\omega$. Evan O' Dorney.