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PL-OM 1999 Problem 6

    W sześciokącie wypukłym ABCDEFABCDEF zachodzą równości: ∢A+∢C+∢E=360∘ ,ABBC⋅CDDE⋅EFFA=1 .\sphericalangle A+\sphericalangle C+\sphericalangle E=360^\circ\ , \qquad \frac{AB}{BC}\cdot\frac{CD}{DE}\cdot\frac{EF}{FA}=1\ . Dowieść, że ABBF⋅FDDE⋅ECCA=1\dfrac{AB}{BF}\cdot\dfrac{FD}{DE}\cdot\dfrac{EC}{CA}=1 .

    Official text Polish Mathematical Olympiad 1999 official paper, page 4. Quoted with source.

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