Question

In ∆ ABC, AB = AC, ∠A = 40 degree, find ∠B​

Answer 1

Answer:

Given :-

In ∆ ABC, AB = AC, ∠A = 40°.

To find :- /_ B.

Solution :-

In ∆ABC ,

AB = AC. ...........{Given}

Therefore, /_B = /_C ........{1}

.......(Isosceles triangle theoem}

Let /_B = /_C, be x°............{2}

/_A + /_B + /_C = 180°

......(Angle sum property of triangle)

40° + x° + x° = 180°

2x° = 140°

x. = 70°

/_B = /_C = 70° ........{From 1,2}

Answer :- Angle B is equal to 70°.

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