lo intercepto, inve.nitcrcliquosduosanguloS Angulum datum tollc ex i8o3 &habcbis fummam angulorum rcliquorum. Turn die, ut femi-fumma crurum datorum, eft ad femidiflerentiam eorundem5fie tangens femifumma: angulorum rcliquorum, eft ad can-gentem femidifferenriae ipforum. Poftrcmd femifummse… … DEMONSTRATION Nam in Trian. B C D,crura fine CB,CD5&CG = C B.Quare i. Zcru. =EG,&iXcru. = EC. Due CH bifc-cantcm B G ad angulos re#os, & fiat ang. G CI = D. Eric an?- t«73 ang. G C H=i ZIL B & D, cujus tangens eft H G: & ang;ICH=7XLLB&D,cujustangcnscftHI.Eft autcm EG . EC s:…
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