Question

In triangle ABC BC=AB and angle B=80 degree then angle A equal toA. 80 degreeB. 40 degreeC. 50 degreeD. None of these​

Answer 1

Answer:

C. 50°

Step-by-step explanation:

Solution:-

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 = 100/2

=> x = 50°

∴∠A=50