211 



U 





Tig 



Ipfa jgimr intnfcLlio cft cui\ j in co-loni ])lano dcfciiptn, 

 ideoquc circulus in fphacrac fuperficic. 



Problcma ]V. 



§. =c. Imcnirc lonim Lciticis, clata rationc cofmuum 

 dimidiorum latcrum. 



Dalur nrquatio cof J. A C ~n cof^, B C. Ji. c. 

 1 -f-cofA C=: /i'-l-/rcofHC, 

 iiiule fcquitui 



n' — ■ I — cof v{/ (cof — n' cof [a. (^ , ct 

 coi \{y =r _. -'Iz:-' _ , 



qTiac exprcfTio ci, qtiain cafii praccedentc (§. i-:.) in\cni- 

 jiuis, acqualis eft ai (qjpofita. Qtiaic fi arcuni 1) C hocce 

 cafu a|)pcllnnius \| ', crit co{^l/~- — cof\|^, h. c. vjy = 

 i s:-' — <^. Fit ncmpc A D B - «, A D =: .1:, D C = \J/, 

 ct arcus DC piolon^elur , doncc ciiculo A D 13 itcrum oc- 

 currciit in D, fiattjuc D^ C'' .n: D C r-; \|/. IJaht inu5; i!aque 

 A l> :-z iw ' - C;. BDz- x.so"— BD, lu.dc fecpiilur 



cofAC c.rr DcofAD - cof ,' cof-I).- - cofAC, cl 

 cofBC .. - {.,riU)f ofC f)' — cofBC. 



Kfl autciu 



cof .\ C :- i 



ci.f A C ..- IV 



' 'l l> C (v. , pioindc 



nc*AllC, uutlc lc(juilur 



I -]■ 



