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Proposed ProblemClick the figure below to see the complete problem 549.ZoomLevel: High School, SAT Prep, College geometry
extend AO to E, E on L2=> x external ang of AEB
Let line BO intersect L1 in point F.As L1 || L2,measure angle OFA = b...(alternate angles test)Consider triangle OFA, by exterior angle theorem measure angle OFA + measure angle FAO =measure angle AOB.Hence, a + b = x
Brings ray Οy // L 1,then x=<BOA=<BOy+<yOA=a+b.APOSTOLIS MANOLOUDIS 4 HIGH SHCOOL OF KORYDALLOS PIRAEUS GREECE