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Difficulty: 3/102023 IOQM 2023 (Q5)

In triangle ABC, let E be the midpoint of AC and F be the midpoint of AB. The medians BE and CF intersect at G. Let Y and Z be the midpoints of BE and CF respectively. If the area of triangle ABC is 480, find the area of triangle CYZ.

Guide / Hint

Hint 1: Start by analyzing the initial conditions and setting up the basic equations. Let BE = 6x.

Hint 2: Look for algebraic properties, symmetry, or geometric theorems to simplify. area (GYZ )  1 .

Hint 3: Proceed with the final algebraic steps to solve the system. area (GBC )  4 .

Solution

Step 1: Let BE = 6x

Step 2: area (GYZ ) 1

Step 3: area (GBC ) 4

Step 4: Area(GBC) = 16(area of GYZ)

Step 5: 1 480

Step 6: area of GBC = of area(ABC) = = 160

Step 7: 3 3

Step 8: area of GYZ = 10

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    2023 IOQM 2023 Q5 - Olympiad Math Olympiad Question | Leminno