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Sagot :

XXX102

Bonsoir,

 

Le triangle EFG est rectangle en F, donc on a :

[tex]\cos \widehat{FGE} = \frac{FG}{GE}\\ GE = \frac{FG}{\cos\widehat{FGE}} =\frac{5{,}5}{\cos 48\char23} \approx 8{,}2 \text{ cm}[/tex]

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