olymmath

RU-SPB 2009 Problem 95

  • Grade 9

ABCABC is acute-angled triangle. AA1,BB1,CC1AA_1,BB_1,CC_1 are altitudes. X,YX,Y - midpoints of AC1,A1CAC_1,A_1C . XY=BB1XY=BB_1 . Prove that one side of ABCABC in 2\sqrt{2} greater than other side.

Dataset text AI-MO AoPS. Quoted with source.

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