Problem

Source: 2022 Oral Moscow Geometry Olympiad grades 10-11 p5

Tags: tangent circles, tangent, geometry



Circle $\omega$ is tangent to the interior of the circle $\Omega$ at the point C. Chord $AB$ of circle $\Omega$ is tangent to $\omega$. Chords $CF$ and $BG$ of circle $\Omega$ intersect at point $E$ lying on $\omega$. Prove that the circumcircle of triangle $CGE$ is tangent to straight line $AF$. (I. Kukharchuk)