In the diagram shown PQ RS The size of the angl... - JAMB Mathematics 2008 Question

In the diagram shown, PQ//RS. The size of the angle marked x is

A

100^o

B

80^o

C

50^o

D

30^o

correct option: b

50 + 30 + y = 180

80 + y = 180

y = 100

180 + x = 180^o

x = 180^o - 100^o

x = 80^o

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