30
36
40
72
Correct answer is A
In the diagram above, α = 2mo (angle at centre = 2 x angle at circumference)
α + 10mo = 360o (angle at circumference)
α + 10mo = 360o(angles round a point)
2mo + 10mo = 360o
12mo = 360o
mo = 360o12
= 30o
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