Let ABCD be a cyclic quadrilateral. Let P be the intersection of \(\overleftrightarrow{AD}\) and \(\overleftrightarrow{BC}\), and let Q be the intersection of \(\overleftrightarrow{AB}\) and \(\overleftrightarrow{CD}\). Prove that the angle bisectors of angle DPC and angle AQD are perpendicular.


Thanks so much!



AnonymousConfusedGuy  Apr 20, 2018

See this very nice answer that was  provided by Melody a while back....





cool cool cool 

CPhill  Apr 20, 2018

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