Question on: JAMB Mathematics - 2010

A
20o
B
23o
C
24o
D
26o
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Correct Option: C
In the diagram above 88o + (3x + 20)o = 180o
(oppsite < s of circlic quad. are supplementary)
88o + 20o + 3x = 180o
108o + 3x = 180o
3x = 180o - 108o
= 72o
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