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Sagot :

Dans un triangle la somme des angles = 180°
Donc
BCA + BAC + ABC = 180°
4x + 2x + 60 = 180
6x = 180-60
x = 120/6
x = 20
d'où
BCA = 4x
BCA = 4*20 (* signifie multiplié par)
BCA = 80°

BAC = 2x
BAC = 2*20
BAC = 40°

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