18.AOB is a line OC is a ray such that OP bisects <BOC and OQ bisects <AOC show that <POQ is a right angle
19.In a quadrilateral ABCD ABIICD and AD II BC show that <ABC=<ADC.
20.lines AB and CD are parallel and Pis a any point in the middle show that <ABE
=<DPB.
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