Question

In an isosceles triangle ,the vertical angle is 40 degree

Answer 1

vertical angle=40 degree

sum of angles of a triangle=180 degree

let the other two angles be x (as the both angles r equal by theorem)

x+x+40=180

2x=140

x=70 degree

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Answer 2

Solution:

Let ∆A = 40

In ∆ABC

∆A+∆B+∆C = 180

40+∆B+∆B = 180

2∆B = 180-40

2∆B = 140

∆B = 140/2

∆B = 70

Hope it helps you.....