olymmath

TSTST 2017 Problem 5

    Let ABCA B C be a triangle with incenter II. Let DD be a point on side BCB C and let ωB\omega_{B} and ωC\omega_{C} be the incircles of △ABD\triangle A B D and △ACD\triangle A C D, respectively. Suppose that ωB\omega_{B} and ωC\omega_{C} are tangent to segment BCB C at points EE and FF, respectively. Let PP be the intersection of segment ADA D with the line joining the centers of ωB\omega_{B} and ωC\omega_{C}. Let XX be the intersection point of lines BIB I and CPC P and let YY be the intersection point of lines CIC I and BPB P. Prove that lines EXE X and FYF Y meet on the incircle of △ABC\triangle A B C.

    Dataset text NuminaMath olympiads. Quoted with source.

    Solutions

    No solution is on olymmath yet. Official and human solutions come first when they arrive. AI solutions come after them, with a label.

    Add a solution

    Locator tstst/2017/p5 · Tag KW3492VQ2D · Edit this page on GitHub · Keys: j next, k previous