Question

observe the adjacent figure find the values of a an b

Answer 1

b = 70° because of vertically opposite angles.....
a= 100° because of alternative interior angles....

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Answer 2

Here,

angle b = 70° (Vertically Opposite angles)

And

Angle b+Angle B = 100° (exterior angle of ∆)

70+a = 100

angle a = 100- 70

Angle a = 30°

Hope it will help