*&3 ) 8i ( »§«• 



lo in O' occurrat et iungatur B 0' itcrnm circulo occnr- 



rens in N', puneta T, R, N' in eadem hnea recla effe,Tab III. 



quod fequenti modo demonftratur. Si iungatur P O', ob Fig- i. 



BPCziBPC + CQD-po, erit 



fin. BPO'=:-cof.(CPB+CQD); 



at in A B P 0' eft fin. P O' B : fin. B P O' =: B P : B 0' et 



quum fit fin. PO'B- cof. BO'D, fiet 



cof. B 0' D : - cof. (C P B + C Q D) zz: B P : B 0'. 



Atqui fupra Artic. 6 , vidimus effe 



cof. D S B : - cof (C P B -f- C Q D) = D Q : D S, 

 ideoque erit 



cof. B 0' D : cof. D S B = f| : -gf . 



Tum vero ob 



fin. B C D : fin. B Q D sta B Q : B O'; et . 

 fin. D S B : fin. D P B — D P : D S ; erit 

 fin.B0'D:fm.DSB-^.fm.BQD:g4.fin.DPB: 

 denique tang.BO'D : tang.DSB-|^.fin.BQD : f^.fin.DPB 

 — B Q . D Q fin. B Q D : D P. B P. fin. D P B 

 = ABQD:ABPD— tf'-i:a'-r-i. 

 Ex quo liquet pun&a T, R, N' in eadem linea reda 

 effe fita. 



§. 13. Quemadmodum in folutione modo allata, 

 valores angulorum x, y per calculum fuerunt eliciti, ita 

 nunc quoque operae pretium eft, vt in valorem anguli z 

 inquiramus. Regrediendo igitur ad aequationes Artic. 2 

 allatas , confequemur : 

 dfta Acad. Imp. Sc. Tom. IV. P. II. L tang. 



