Question

In triangle ABC AB is equals to AB and Angle B equal to 80 find the angle A​

Answer 1

∠A = 20°

Explanation:

Given:

Line AB equal to line AC

So, we can say that;

∠B = ∠C

So

∠B = ∠C = 80°

Using angle sum rule

∠A + ∠B + ∠C = 180°

∠A + 80° + 80° = 180°

∠A = 20°