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Sagot :

Bonjour,

1)

AB // DC

=> BDC alterne interne =  ABD = 40°

2)

ADB = 180 - 100 - 40 => 40°

ADB = BDC = 40°

=> DB bissectrice de l'angle ADC

3)

xDC angle plat

ADx = 180 - 40 -40 = > 100°

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