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MathNet 2022-part-06 — 196 problems (EN–VI) Question 95

Math Olympiad Vault · MathNet 2022-part-06 — 196 problems (EN–VI)

Question 95

Let $A_{1} B_{1} C_{1}$, $A_{2} B_{2} C_{2}$, and $A_{3} B_{3} C_{3}$ be three triangles in the plane. For $1 \leq i \leq 3$, let $D_{i}$, $E_{i}$, and $F_{i}$ be the midpoints of $B_{i} C_{i}$, $A_{i} C_{i}$, and $A_{i} B_{i}$, respectively. Furthermore, for $1 \leq i \leq 3$ let $G_{i}$ be the centroid of $A_{i} B_{i} C_{i}$.
Suppose that the areas of the triangles $A_{1} A_{2} A_{3}$, $B_{1} B_{2} B_{3}$, $C_{1} C_{2} C_{3}$, $D_{1} D_{2} D_{3}$, $E_{1} E_{2} E_{3}$, and $F_{1} F_{2} F_{3}$ are $2, 3, 4, 20, 21$, and $2020$, respectively. Compute the largest possible area of $G_{1} G_{2} G_{3}$.