In the triangle, If AB = AC and ∠ABC = 72°, then ∠BAC is:

36° 30° 54° 18°

36°

In a triangle ABC, AB = AC So, ABC is an isosceles triangle. ∠ABC = 72° Equal sides of a triangle form equal corresponding angle. ⇒ ∠ABC  = ∠ACB = 72° In a triangle ABC, ∠ABC +∠ACB +∠BAC = 180°  72° +  72° +∠BAC = 180° ∠BAC = 36°