In ∆ABC, BC= AB and LB = 80º, then find ∆A Question In ∆ABC, BC= AB and LB = 80º, then find ∆A in progress 0 Math Arianna 7 days 2021-09-11T04:17:14+00:00 2021-09-11T04:17:14+00:00 2 Answers 0 views 0

## Answers ( )

Answer:the above answer is correct

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It’sMr.Jattandit’sthetruthStep-by-step explanation:In triangle ABC, BC=AB and angle B= 80, then angle A = 50

Solution:

Given that in triangle ABC, BC = AB which means ABC is an isosceles triangle.

We know the sum of angles in a triangle is 180°. Since it is an isosceles triangle the measure of two angles will be same. Let ∠A = x and ∠c = x

We know,

Sum of all angles = 180°

x+x+80° = 180°

2x= 180°-80°

2x=100°

x=100÷2

x=50

Thus the measure of ∠A = 50°