Question

ABC, AB=BC and < B=80. Then < A is equal to what?

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=180∘

⇒2x=180∘ −80°

⇒2x=100∘

⇒x=50∘

∴∠A=50∘

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