ABC is a triangle and the sides AB, BC and CA are produced to E, F and G respectively. If ∠CBE = ∠ACF = 130°, then the value of ∠GAB is :

A. 100°

B. 80°

C. 130°

D. 90°

Answer: Option A

Solution(By Examveda Team)

We know that
⇒ Add of total exterior angle of a triangle (polygon) = 360°

⇒ So, 130° + 130° + x° = 360°
x° = 100°