Το θεώρημα του Ceva

Given a triangle $ABC$, and points $D,E,$ and $F$ on the sides $BC,CA$, and $AB$ respectively, then the segments $AD,BE$ and $CF$ are concurrent, if and only if 

${\displaystyle \frac{FB}{AF}}\times {\displaystyle \frac{DC}{BD}}\times {\displaystyle \frac{EA}{CE}}=1$.

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