1.

Solve............................

Answer»

Let anlgle AOB AND ANGLE DOC BE 4X and 5x
AOB=COB (vert. opp . angle)
doc =AOB(")
aob+boc+doc+aod=360. COMPLETE angle
4x+5x+4x+5x=360
18x=360
x=360/18
x=20
therefore angle cob=aod=4x
4(20)
80



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