Answer
B.51
Step-by-step explanation
OXYZ is a quadrilateral. The opposite sides of a quadrilateral add up to 180.
Angle ZOX at the center is 129.
< ZOX is opposite to < XYZ
∴ < ZOX + < XYZ = 180
< XYZ = 180 - ZOX
= 180° - 129°
= 51°
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