Bonjour
Calculons OJ
cos 65° = OJ/IJ
OJ = IJ x cos65° = 4 x cos65°
Calculons VN
cos 40 = 4/VN
VN = 4/cos40
Calculons l'angle A
l'angle A = cos A = AB/AC = cos^¨-1 (6/7,5)
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Bonjour
Calculons OJ
cos 65° = OJ/IJ
OJ = IJ x cos65° = 4 x cos65°
Calculons VN
cos 40 = 4/VN
VN = 4/cos40
Calculons l'angle A
l'angle A = cos A = AB/AC = cos^¨-1 (6/7,5)