Question

In triangle abc ab=bc if angle b is 40 degree than find angle a

Answer 1

Step-by-step explanation:

The exterior angle is the sum of the interior opposite angles. Since AB=AC, ∠ABC=∠ACB.

Since the sum of angles in a triangle is 180

∘

, ∠BAC=100

∘

Hence, external angle at B = ∠ACB+∠BAC=100

∘

+40

∘

=140

∘

Answer 2

Answer:

See this picture.

Hope it helps you...!