Tiim vero qiiia triangulum ABC praebet 

 Z»' — fl' -f- «y' — 2 ar a; cof. (d — Cp) , fieC 

 cof.(0-(]))zz"-l^-:-lpi! et 



Hinc colligitur; 



<^^£ L_ H,2 — t)- (4 fl» (j.^ -4- c») — /a^ -+£» — v')i) pf. 



// / — riT7Vfcc-^T>» fM .(g — CD:?) . :^ -Pd ■» V (4.3 ^ (fc^ -i-c' ) — fa^ -,- b^ - t>'F ) 

 //a,;i/-<p;VN(y--t-'^;-i,^j — V(N('v'-+-c*;-L*)(+9'6'-(a--H^--v'A/ 



§. 8. Pofito ~-p\ ~- q: aeqnationes noftrae 

 differentiales fequenti modo exprimentur : 



[v^ -{-€■] p — cc q. cot. (0 - (P) r:; L ;. 



[v^-\- C--)p^- 2.C c pq coi.[^ -<^)^ q' '^cc coi.{^-<^Y-\-v^)-'^ \ 



et fi infuper flatuatur q~pr; habemus ex priori aequar- 

 tione : 



l,z=:iCv^-hc'-ccrcot.(Q-(p))\ < 

 et ex pofteriori 



f-liiv^-^c^- 2f (rrcot.(0-4))+r'(i-£-cot.(e-4:^}' -f I-)). 

 Et ope harum aequationnin , aequatio elicixur algebraica, 

 folas variabiles r, v et cot. (d —0) inuoluens, vbi qiiidem 

 ob cof. {^ — (p)zz ""-—^'.f^i Jft^ aequatio quoque ad aliam 

 -quae folas r et ^ inuohiit, reduci potcrit. Cr.eterum c- 

 iusmodi redu(flione ncquidem opns t\\ , nam fi quadratum 

 fumcndo prioris aeqnationis, pofteriorem vero per v^ -\r C^ 

 nuiUiplicando , producflorum accipiatur difFerentia , haoc 

 coDigetur aequaiio: 



'^' r iii^'-L-w ^ ''') =^ N (^' + c^) ~ L. 

 Hincqne iam patet data diftancia A C — 'y , vnde fimul 

 anguUis BACzzO-^ innotefcit, dari incognitas p, q, 



feu 



