Question

In ∆ABC, BC=AB and B = 80°, the A is equal to:​

Answer 1

Answer:

<A=80°

Step-by-step explanation:

because, in ∆abc ,

bc=ab

then b=80°,so a=80°

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Answer 2

Answer:

Given:-

BC=AB

∠B=80°

To find:- ∠A

Solution:-

If BC=AB

∠A=∠C (if two opposite sides of a triangle are equal then their opposite angles are also equal)

but we don't know any

But

∠A+∠B+∠C=180°(sum of all interior angles of a triangle are supplementary)

Let the equal angles A & C be x

that is

x+∠B+x=180

2x+80=180

2x=180-80

2x=100°

x=100/2

x=50°

therefore the angles are

∠B=80°

∠C=x=50°

∠A=x=50°