-"•Kl ) 2P ( ^n^" 



toi. a t^ ^ — y^^ p» -I- d <i- -j- cf r«) » 



cof. ^ r 5; - _-Mi-=i4.''_p_ 



Interim tamen analogiae confidere non poflumus, qnia 

 pundlum p extra noftrum triangulum cadit, vnde inuefti- 

 gationem fequenti inodo infticuamus. 



$. 14. Omni ambiguitati occurremus, fi refolua- 

 mus triangulum a z r, in quo cognita funt latus a z, cum 

 angulis zar et azr, vnde fiet 



COC a r ZZZ ^nrdr — prrd n ±±_d_P__ 

 9 7 •+- r r V ( J p- -+- d q^ H- d r») » 



quae expreOlo ob rdr-—pdp-qdq transmutatur in hanc: 

 cof. a r z — n dp — p d 1 



^ {d p^ -i- d q^ + d r^) ' ^ 



Pjraeterea vero etiam hinc cognofcemus 

 tang. arzzi' ^/- ''ii et 



° — p d r — r d p 



tang. zr^ ^HIi^ +^±Ai3. 



§. 15. Simili modo refolui poterit triangulum 

 X a q, in quo praeter latus az pariter dantur ambo an- 

 guli zaq et azq: reperirur enim 



Cof a O "" — p d r - r d p 



" '1 ^ — V (J p' -H d 9' -+- d r^) » 



tang. aq-^i^^^^A^ et 



=> ' qdp-pdq 



tang. q zz= n ^(^ P' -^ d g-' -^ d r^) ^ 



Deniqu€ i^m vidimus arcum £ n e^c menfuram anguli 

 cam, et quia arcus cb et np funt quadrantes, erit arcus 

 bp — cn, vnde erit 



tang. bp— tang. mac — ^4^ -^^ , 

 vade porro fit 



tang, ep — rdp-gdr 

 ^ * — fdr-rdf 



D 3 §. i<j. 



