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SHARYGIN 2020 Problem 24

    Let II be the incenter of a tetrahedron ABCDABCD , and JJ be the center of the exsphere touching the face BCDBCD containing three remaining faces (outside these faces). The segment IJIJ meets the circumsphere of the tetrahedron at point KK . Which of two segments IJIJ and JKJK is longer?

    Dataset text AI-MO AoPS. Quoted with source.

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