Question

In ∆ ABC, BC=AB and <B=80° then find <A​

Answer 1

Answer: BC=AB

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

let the 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=50^0

hope it helps

tqm///.