olymmath

ISL 2014 G2

    Let ABCA B C be a triangle. The points K,LK, L, and MM lie on the segments BC,CAB C, C A, and ABA B, respectively, such that the lines AK,BLA K, B L, and CMC M intersect in a common point. Prove that it is possible to choose two of the triangles ALM,BMKA L M, B M K, and CKLC K L whose inradii sum up to at least the inradius of the triangle ABCA B C. (Estonia)

    Dataset text NuminaMath olympiads. Quoted with source.

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