Sagot :
Bonjour.
BDA = 180° - (ABD + BAD)
= 180° - (56° + 67°)
= 180° - 123°
= 57°
ADC = BDC - BDA
= 180° - 57°
= 123°
DAC = 180° - (ADC + DCA)
= 180° - (123° + 22°)
= 180° - 145°
= 35°
L’angle BDA = 180 - 67 +56
=180- 123
=57
L’angle ADC = 180-57
=123
L’angle DAC = 180- 123+22
= 180-145
= 35
=180- 123
=57
L’angle ADC = 180-57
=123
L’angle DAC = 180- 123+22
= 180-145
= 35