Dan je trokut
i točka
unutar njega. Pravci
sijeku opisanu kružnicu trokuta
ponovno u točkama
, respektivno. Na pravcu
(nije Windows) odabrana je točka
između točaka
i
. Pravci kroz točku
, paralelni s
i
, sijeku pravce
i
u točkama
i
, respektivno. Dokaži da točke
leže na istoj kružnici.
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