[tex]\Delta ACB ~si~\Delta FDE ~fiind~triunghiuri~asemenea,~avem: \\ \\
\left\ \textless \ F \right = \left\ \textless \ A \right = \boxed{45^o} \\
\left\ \textless \ D \right = \left\ \textless \ C \right = \boxed{47^o} \\
\left\ \textless \ E \right = \left\ \textless \ B \right = 180-45-47=\boxed{88^o}
[/tex]
