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SHARYGIN 2021 Problem 85

    Points A1,A2,A3,A4A_1,A_2,A_3,A_4 are not concyclic, the same for points B1,B2,B3,B4B_1,B_2,B_3,B_4 . For all i,j,ki, j, k the circumradii of triangles AiAjAkA_iA_jA_k and BiBjBkB_iB_jB_k are equal. Can we assert that AiAj=BiBjA_iA_j=B_iB_j for all i,ji, j '?

    Dataset text AI-MO AoPS. Quoted with source.

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