In the diagram, XY is a straight line.
A.
60\(^o\)
B.
90\(^o\)
C.
100\(^o\)
D.
120\(^o\)
Correct answer is B
<POX = <POQ; <ROY = QOR
2 <POQ + 2 <ROY = 180
2(<POQ = <ROY) = 180
<POQ + <ROY = 90