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|AC|/|CE| = |CB|/|FC|
Ponieważ:
|<FBC| = |<EAC|
|<CFB| = |<CEA| = 90°
Mamy ΔACE (zielony) ~ ΔBFC (czarny), czyli zachodzi:
|AC|/|CE| = |CB|/|FC|
Stąd ΔABC ~ ΔFEC
jak masz pytania to pisz na pw