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2 circumcircles of similar triangles and 2 lines concurrent

Source: : I Soros Olympiad 1994-95 Ukraine R2 9.2 https://artofproblemsolving.com/community/c2416727_soros_olympiad_in_mathematics

June 6, 2024
geometrycircumcirclesimilar triangles

Problem Statement

Triangles MA2B2MA_2B_2 and MA1B1MA_1B_1 are similar to each other and have the same orientation. Prove that the circles circumcribed around these triangles and the straight lines A1A2A_1A_2 , B1B2B_1B_2 have a common point.