ponanfur (Fig. 3.) arcus A H , B H producfli, vsque dum 

 ciiCLilo maximo BEA itcrtim in A', B' occurrant, eric^ 

 fin. : A H - cof. i A' H ec fiu. ; B H = col. ; B' h', ' 

 Cjuare ob fin. 1 A H et fin. ^ B H in data rationc , ratio 

 quoque cof. ^ A' H, cof ;B'H crit d-ita. Denique fi ratio 

 tan^ciuiinn cx oimidiis arcuous AH, BH fuerit drita, 

 curua quaefita circulus c(Te netjuic , nam fi tlacuatuc 

 tang. i X : tjng. [ y in d ua r-itione, erit quoque 



m {i — cof. X] (i + cof. 7) — (i — cof. j) (i 4- cof. x). 

 Hinc ob \ .0 



I — cof. .V — I — cof. (a — z) -\- '2. fin. a fin. :: cof. ' Cj)^ ; 

 I + col. j' zz I + col". (^a — z) — z fin. a fin. z fin. { $)' •, 

 1 4- col. .V — I + c()(. (j.1 — :2) — 2 fin a fin. ;3 cof ,; Cp'j 

 '■» I — cof ^ :z: 1 — col. ^a — sj + 2 fin. a fiu. z fin. ^ 4^* • 

 idcoque ^ '? -i 



i« -^i^x — cof. j:) (i -\' co^.y) ~ fin. (^— ~)' + - fin. a fin z cof (p 

 -f i fiii, a fiii. ~ co(. (^ — 2) — fin. a' fin. ;s' fin. (p"i ' 

 (i + cofr jr) ( I -- cof y) r fin. a — ^:^)'— 2 fin. a fin. z cof (J) 

 4- 2 fiii. a fin. x: cof \^a — z) — fiu. a' fiu. z' fin. CP', ob 

 cOf Cp = col. ; (p= - fin. i Cp^ et 

 ifin.Cpiz: 2 fip. :(pcof lCp , 

 aequatio igirur pro curua crit : '■- — --;.!■; Uii.T 



in{ fin ((/ — 2;)'+ 2 fin.<7fin.::cor. (p-f 2 finf. fl^fin./cof' (<7— 2} 

 — fin.fl^fin.s' fin.0') r fin. (^ — c;)'— 2 fin «fin.^jcofcp 

 4-2 fin. fl^fin. .2' cc«f(a — s)— fin.a'fin. i;Min,(|)% 



quac quidcm , cafu m — j , exifttntc tunc cof. Cp — o, cft 



M 3 pro 



