Question

In  ABC , BC = AB and  B = 80, Then A is equal to​

Answer 1

Step-by-step explanation:

Answer

BC=AB

⇒∠A=∠C (As angles opposite to equal side are equal)

let thte angles be x each.

Now by angle sum property

∠A+∠B+∠C=180

∘

⇒x+80

∘

+x=180

∘

⇒2x=180

∘

−80

∘

⇒2x=100

∘

⇒x=50

∘

∴∠A=50

∘

Answer 2

As BC=AB

⇒∠A=∠C (As angles opposite to equal sides are equal)

Let the angles be x each.

Now by using angle sum property of triangle

∠A+∠B+∠C=180⁰

⇒x+80⁰+x=180⁰

⇒2x=100⁰

⇒x=50⁰

So ∠A=50⁰