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KöMaL 2024 A878

    Let point AA be one of the intersections of circles cc and kk. Let X1X_1 and X2X_2 be arbitrary points on circle cc. Let YiY_i denote the intersection of line AXiAX_i and circle kk for i=1,2i=1,2. Let P1P_1, P2P_2 and P3P_3 be arbitrary points on circle kk, and let OO denote the center of circle kk. Let KijK_{ij} denote the center of circle (XiYiPj)(X_iY_iP_j) for i=1,2i=1,2 and j=1,2,3j=1,2,3. Let LjL_j denote the center of circle (OK1jK2j)(OK_{1j}K_{2j}) for j=1,2,3j=1,2,3. Prove that points L1L_1, L2L_2 and L3L_3 are collinear.

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