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![[Post New]](/templates/default/images/icon_minipost_new.gif) 4 Feb 2008 20:30:40 IST
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angle ABQ = angle AQT ( by theorem) .........(1)
angle ABP = angle APT ( " " ) ..........(2)
In triangle TPQ , angle T + angle P + angle Q = 180
=> angle ABQ + ABP + angle T = 180
=> angle PBQ + angle T = 180. So they are concyclic
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