iS PROPRIETATES 



Nunc vero , ob ang.y^^ i8o° — 2 (/-}-• i)a , erit 



r /• . \ cc-aa-hb , ,- / ■ , \ . _ ce-(6-a ')« 



coCafi+ija:^— T71, — et i +cor.2(?4-i )«::-7T6 



vnde 2D-VI — ■ cv — ../in.a • 



At eft fl:r — fin.a: fin. 2(i-t-i)a , ideoque 35—51 



V — T./m. ( i -j- I ) a 



, vnde coUigimus 



C\f (b -+-a ) co(.[i-¥- I ) g -t- ( 6 — a ) V — f/?n. ( f -4- Q a 



5fi 2V — !.//«.( zH- I )a ^* 



<^ — • 2 V — i./?n. ( z -*- I )a 



Qiioniam latera fl et ^ funt fmibus nngulorum op- 

 pofitorum proportionalia, llatuamus a ::= 2/fm. a, et 

 ^rr 2/fm.(2/-t- I )a , eritque 



.flcof (i -t- 1 ) «n/ ( fm. (i 4- 2 ) a — fm. /a) ,• « fm. (i + i )« 



zr/(cof za — cof (i H- 2 ) a) 

 i^cof (i-4- i)ar:/(fm.(3i4-2)a4-fm.ia),- ^fm.(i-j-i)a 



r::/(cofia — cof (3i-t-2)a} 

 Tnde colHgimus : 



(«-H^)cof (i+i )az/(fm.(i4-2)a-l-fm.(3i4-2)a) et 

 {b — fl)fm,(i4- i)ar/(cof (i + 2)a— cof (3i-}-2)a}. 

 Quare cum fit generatim 



fm. [X + fm. Kzr 2 fm. *^^Vof "-^ et 



cof fx - cof V — 2 fm. ^^^'fm. ^^^ 

 habebimus : 



(fl + 6)cof (i4- I )arr ^/fm.^ai^- 2)acof ia et 

 (^ -fl) fm. (i-i- I )a ::: 2/fm. ( 2 i-h 2} afm.ia 



ac 



