olymmath

KMO 2021 Problem 6

    Let ABCABC be an obtuse triangle with ∠A>∠B>∠C\angle A > \angle B > \angle C , and let MM be a midpoint of the side BCBC . Let DD be a point on the arc ABAB of the circumcircle of triangle ABCABC not containing CC . Suppose that the circle tangent to BDBD at DD and passing through AA meets the circumcircle of triangle ABMABM again at EE and BD‾=BE‾\overline{BD}=\overline{BE} . ω\omega , the circumcircle of triangle ADEADE , meets EMEM again at FF .

    Prove that lines BDBD and AEAE meet on the line tangent to ω\omega at FF .

    Dataset text AI-MO AoPS. 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

    Similar problems

    These problems have the most words in common with this statement.

    Locator kr-kmo/2021/p6 · Tag 7MXTKB3JW6 · Edit this page on GitHub · Keys: j next, k previous