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Opposite angles in a cyclic
Quadrilateral add up to 180o
a + 3b = 180o
2b + 100o = 180
2b = 80o;
b = 40o
Substitute b = 40o in
a + 3b = 180o
a + 3 x 40o = 180o
a + 120o = 180o;
a = 60o
johnmulu answered the question on June 9, 2017 at 09:11
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