Question

in triangle ABC, the exterior angle ACD is 110°. Find the measure of angle BAC, if angle ABC = 65°​

Answer 1

An exterior angle of a triangle is equal to the sum of the opposite interior angles. 

Hence, In this case ∠A and ∠B

So,

∠A+∠B=140∘

as ∠A=∠B

or,2∠A=140∘

∠A=∠B=70∘