Respuesta :

lukyo

•  y is vertically opposite to the one whose measure is 43º.

So,

y = 43º.


•   x and y are supplementary angles:

x + y = 180º

x = 180º – y

x = 180º – 43º

x = 137º.


•   z and x are vertically opposites.

So,

z = x

z = 137º    <———    this is the answer.


I hope this helps. =)

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