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Sagot :

1)

COS 53=0.601
5.4:0.601=9
DE=9

2)

90°-53°=37°

B Pythagore

9(au carre)=5.4(au carre)+EF(au carre)

EF=91-29.6

EF = 51.4

Racine carre de 51.4 = 7.169

EF=7.169

 


 

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