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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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°