Respuesta :

Here, ∠1 + ∠2 = 180   [ Supplementary Angles ]

∠1 + ∠6 = 180   [ ∠2 = ∠6 ]
(corresponding angles)

123.5 + ∠1 + 180
∠1 = 56.5

In short, Your Answer would be Option A

Hope this helps!
Photon
The answer would be : Option A.

Hope this helps !

Photon

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