Question

in∆ABC, BC=AB and angle B=80​

Answer 1

Answer:

50°

Step-by-step explanation:

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+80 ∘ +x=180 °

⇒2x=180 ∘ −80 ∘

⇒2x=180 ∘ −80 ∘ ⇒2x=100 ∘

⇒2x=180 ∘ −80 ∘ ⇒2x=100 ∘ ⇒x=50 ∘

⇒2x=180 ∘ −80 ∘ ⇒2x=100 ∘ ⇒x=50 ∘ ∴∠A=50 ∘

★ hope it's helpful ♥