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In the diagram above PQ Rs The size of the angl... - JAMB Mathematics 2008 Question

In the diagram above, PQ//Rs. The size of the angle marked x is
A
100o
B
80o
C
50o
D
30o
correct option: b

Exterior angle = sum of two interior opposite angles

y = 50o (vert. opp ∠s are equal)

X = y + 30

X = 50 + 30

X = 80o

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