bjr
formule
AB.AC = ||AB|| x ||AC|| x cos BAC
6 = 4 x 3 x cos BAC
cos BAC = 6/(4 x 3)
= 1/2
angle BAC = 60°
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bjr
formule
AB.AC = ||AB|| x ||AC|| x cos BAC
6 = 4 x 3 x cos BAC
cos BAC = 6/(4 x 3)
= 1/2
angle BAC = 60°