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In the diagram O is the center of the circle If... - WAEC Mathematics 1989 Question

In the diagram, O is the center of the circle, If ∠POQ = 80o and ∠PRQ = 5x, find the value of x.
A
4o
B
8o
C
16o
D
20o
correct option: b

80o = 2 x 5x(angle at the center)

=80o = 10x; x = 80o/10

= 8o

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