in the diagram below, XY and YZ are tangent to O. What is the measure of XYZ?
A,64
B.51
c.47
D.102

Answer
B.51
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°