اذا كانت الزاويتان متكاملتان فإنهما متجاورتان على مستقيم واحد. دائرة

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Dragutin Svrtan and Darko Veljan, "Non-Euclidean versions of some classical triangle inequalities", Forum Geometricorum 12 2012 , 197—209
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; Askey, Richard; Roy, Ranjan 1999
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