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in the diagram angle 20o is subtended at the ce... - WAEC Mathematics 2009 Question

in the diagram, angle 20o is subtended at the centre of the circle, find the value of x

A
30o
B
50o
C
80o
D
100o
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Correct Option: B

2(30 + x) = 360 - 200

60 + 2x = 160

2x = 160 - 60

2x = 100

x = (\frac{100}{2})

x = 50

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