In a ΔABC, ∠ABC = 2∠CAB, if the side BC is extended to D and ∠ACD = 126°, then ∠CAB is:

A. 84°

B. 36°

C. 42°

D. 63°

Answer: Option C

Solution(By Examveda Team)

Let,
∠CAB = x
∠ABC = 2x
∠ACD = 3x = 126° (by exterior angle)
3x = 126°
x = 42°
∠CAB = 42°