Respuesta :

The answer to this question is A - 56.5.
Angles 6 and 1 are both on a 180 degree line. When we subtract the measurement of 6 from 180 degrees, we can get the measurement for angle 1.
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!

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