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HMMT 2022 G9

  • Geometry
  • Answer

Let A1B1C1,A2B2C2A_{1} B_{1} C_{1}, A_{2} B_{2} C_{2}, and A3B3C3A_{3} B_{3} C_{3} be three triangles in the plane. For 1≤i≤31 \leq i \leq 3, let Di,EiD_{i}, E_{i}, and FiF_{i} be the midpoints of BiCi,AiCiB_{i} C_{i}, A_{i} C_{i}, and AiBiA_{i} B_{i}, respectively. Furthermore, for 1≤i≤31 \leq i \leq 3 let GiG_{i} be the centroid of AiBiCiA_{i} B_{i} C_{i}. Suppose that the areas of the triangles A1A2A3,B1B2B3,C1C2C3,D1D2D3,E1E2E3A_{1} A_{2} A_{3}, B_{1} B_{2} B_{3}, C_{1} C_{2} C_{3}, D_{1} D_{2} D_{3}, E_{1} E_{2} E_{3}, and F1F2F3F_{1} F_{2} F_{3} are 2,3,4,20,212,3,4,20,21, and 2020, respectively. Compute the largest possible area of G1G2G3G_{1} G_{2} G_{3}.

Dataset text NuminaMath olympiads. Quoted with source.

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