Question

1. In triangle ABC , BC= AB and <B= 80° , then <A is equal to


80°
40°
50°
100°​

Answer 1

Answer:

<A =50

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Answer 2

Answer

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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