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2014-02-13T22:16:22+02:00
FE||AC⇒(T.Thales)AF/AB=EC/BC
GE||AB⇒(T.Thales)EC/BC=GC/AC
Din cele doua egalitati, obtinem AF/AB=GC/AC
Acum AF/AB+AG/AC=GC/AC+AG/AC=(GC+AG)/AC=AC/AC=1
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