AOB + BOC = 180°
AOB = 180 - BOC
AOB = 5/4 BOC
180 - BOC = 5/4 BOC
BOC + 5/4 BOC = 180°
9/4 BOC = 180°
BOC = 80°
DOB = 90 - 80 = 10°
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AOB + BOC = 180°
AOB = 180 - BOC
AOB = 5/4 BOC
180 - BOC = 5/4 BOC
BOC + 5/4 BOC = 180°
9/4 BOC = 180°
BOC = 80°
DOB = 90 - 80 = 10°
<BOA = 180° x 5/(5+4) = 900/9 = 100°
<DOB = <BOA - <DOA = 100 - 90 = 10°