ray OB is the bisector of angle AOC and ray OC is the bisector of angle BOD. m<AOD =120 find m<AOB

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  1. Since OB bisects AOC, AOB=BOC
    Since OC bisects BOD, BOC=COD
    So, all 3 angles are equal, and are 120/3 = 40

    yeah, I know, the terminology is loose, but you can fill in the appropriate correct language

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