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Answer: The measure of non-reflex ∠DOB is 108° and the measure of reflex ∠DOB is 252°.Explanation:[tex]DOB = AOD + AOC + COB \\\\3.5y = y + 180\\3.5y - y = y + 180 - y\\2.5y = 180\\\frac{2.5y}{2.5} = \frac{180}{2.5} \\y = 72\\[/tex]Hence y = 72, so in the equation replace y with 72.[tex]3.5y \\3.5(72)\\252\\[/tex]DOB = 360 - 252 = 108So, the angle DOB is 108 degrees and the reflex angle DOB is 252 degrees.

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