∵,∠1=∠2 ,∠3=∠4
∴∠4=∠1+∠2=2∠1
∠DAC=180°-∠3-∠1-∠2
=180°-∠3-∠2-∠BAC+∠1
=180°-∠2-∠1-63°
=117°-∠BAC+∠1-∠1
=117°-63°
=54°
∴∠DAC=54°
∵,∠1=∠2 ,∠3=∠4
∴∠4=∠1+∠2=2∠1
∠DAC=180°-∠3-∠1-∠2
=180°-∠3-∠2-∠BAC+∠1
=180°-∠2-∠1-63°
=117°-∠BAC+∠1-∠1
=117°-63°
=54°
∴∠DAC=54°