JD ARCVS CIRCVLARES. »5 



ita \t C\t AC — a y B Czz. i/ ; ex C ad fingnla diuifio- 

 num puncla agiintur redae C«, C^, Cf, C^, etc. 

 eritque , fi arcus A c contineat m partes , red:a C c —V 

 (cc -\-dd-\r 2 cdcoC. ^~ ). Dudo enim ex centro O radio 

 Oc — c, erit angulus AOf— ^ , et CQ—A C-AO r: 

 <f, ideoque reda Cc — V {cc-\-dd~\- icdcoC. AOc). 

 Quamobrem radius circuli ellipfis propofitae ifoperimetri 

 erit 



„ AO-t-Cg-t-C6-|-Cc + Cd-HCg-t-C/-4-Cg-HCfc-f-C;-f-Cfe-f-C j 



' n 



Coroll. 4. 



45. Cum autem expreffiones cofinuum pro diuerfis 

 ■Valoribus numeri n fint fequentes : 

 fin — 2. : cof. 7 ~ o ; 



fi»=3 ; cof fr=|; cof ^ = - i 

 fi«=r4 cof 1=^,; cof ^' =r o ; cof ^ rr - ^. 

 fin-6 ; cof?-^;cof.^=i-cof^-OiCof ?=-|;cof^-f=-^\ 

 fi«=r 12 icof ^ = ^;rr- ;cof V:=r^;cof -- :=. v_. . ,„,; i^ :z: [ 

 cof f? = fe' ; cof ^:= o ; cof ^ r= -^^t ' ; cof ^ ^ - 

 cof ^f= --?;cofif? = --?;cof '-^ = --^-^ 

 Sequentes formulae ad valorcm radii circuli quaefiti r 

 proxime iuueniendum \identur aptiffimae : 



»y. 



Tom. n. Nou. Comment. D I. r zr: 



