In triangle ABC, ad intersects BC at point D, CE is perpendicular to ad at point E, connect be, ∠ ABC = 45 degrees, ∠ ADC = 60 degrees, DC = 2bd, try to find the degree of ∠ C

In triangle ABC, ad intersects BC at point D, CE is perpendicular to ad at point E, connect be, ∠ ABC = 45 degrees, ∠ ADC = 60 degrees, DC = 2bd, try to find the degree of ∠ C

∵∠BAD=∠ADC-∠ABC=15°
In addition, BD = de = 1 / 2dc, ∠ bed = ∠ EBD = 30 ° = ∠ bad + ∠ Abe,
∴∠BAD=∠ABE=15°
AE=BE
∠ECD=∠EBD=30°
BE=CD
∴AE=BE=CD
∠ACE=45°
∠ACB=∠ACE+∠ECD=75°