Question

In ∆ABC, BC = AB and ∠B = 80°. Then ∠A is equal to: *

1 point


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Answer 1

Step-by-step explanation:

A is equal to (180-80/2)=50°

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Answer 2

Answer:

50⁰

Step-by-step explanation:

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