= (197) = 



quae expredio qiio magis contrahatur, ponamus br. gr. 



aa-i-bb-*-c c — A; aV-hbG-hcH — E et af-hbg-i-ch — e^ 

 ficque impefrabimus hanc formam: 



Zz- = A-h2es-2ES-2Ss(Ff-i-Gg-^Uh)-^s'-hS\ 

 Cum igitur, vt modo ante vidimus, iit F/-f- Gg -t- H/:' r cof. w, 

 erit 



Zz'=:A-i-2es—2ES — 2Sscoi:.(^-hs''-hS\ 



§. 17. Deinde vero has denominationes in fubfidium 

 vocando reperietur per noflras coordinatas 



A 2* = (a-hfsy- -^{b-^gs/ -\-{c-hh s)% 

 ideoque erit ♦ 



Simili modo erit 



fl z^ := (^ - F S7 -f- (^ -Gsy-\-(c-n Sj% 



adeoque 



^ Z^ — A — 2 E S -4- S S. 

 Hinc igitur binae aequationcs fupra datae dabunt has ; 



A-+-2fJ-l-.fJ— 2S"-+-A— -2ESh- 2fi— 2SjCOf.W-f-J* 

 A — 2 E S -^ S S = 2 J J^ A — 2 E S -t- 2 ^ J — 2 S J COf. W-H S' 



quae ad has formas reducuntur : 

 S — E — j cof oj — o 



s -{- e — S cof co — o. 



§. 18. Ex his i:im duabus aequationibus fatis fimpli- 

 cibus ambo interualla quaefita A Z — S et ^ 5 — J, ita deter- 

 minantur , vt fit 



S ZIZ F. — e cof. o j g^ K Cif. co — g 



B b 3 Co- 



