ao DE REDVCTIOXE UXEARVM CFRT'ARVM 



gulus ACB — 0, tiim dcminb cx cunnc qnouis puncf^o 

 M :id AC pcrpcndiculo MP, pofitisquc coorJiiv.uis AP 

 — .V, PMzrj diibimr :icqu:itio intcr .v ct v , cx qiui 

 rcpcrictur fubnormalis PN — ^ai' > ducatur nornialis M N , 

 ct \t)cctur angulus ANM:z:i;, qui crit amplitudo arcus 

 AM, cric j-^ — tang. c, ficque tam abfcillii .v qu;im :\p- 

 plicata y pcr angulum <v potcrit dcfiniri , quibus inucntis 

 crit M NzzjT^. Deinde in MN, (i opus cll , prcxluclam 

 cx C dcmittatur pcrpcndiculum CS , ob CN n: ^ - .v 



-^-a-X'^ crit. NSzz(^-.v)cof. c-^-^,', 

 koquc tota rcifla M S— (^z— .v) co(. c-Hjfini', ita 

 .t datum quemuis angulum '■j longitndo rc<n:.ic M S 

 poflit dcfiniri. liidicctur hacc rcda MS nmplirudini v 

 rc(pondcns hoc figno [v], ita \t fimilcs rcdac angulis 



^ > ir > lf > ctc. rcfpondcntcs cxhibcantur Iiis fignis [ ^^ ] , 

 ['^*J,['-*] ctc. quibiis iiicntis fcqucntcs f(>rmulac continuo 

 magis ad valoicm arcib AM appropinquabunt : 

 AM — ^Jia-h^) 

 AM-l6{a-\-b-\-2[i]) 



AM-iO(tf-i-^-H2[|]-4-2[7'j) 



AM:^;0(^-f-^-|-2[n-f-=[?- l-H^T 1) 



AM-,',0(tfH-^H-2[f]-|-:i[ VM-+-MV'j-4-2L V']) 

 Gcncralitcr autcm i\ n rumatur pro numcro diuifionuni crit 

 co cx.idius , quo maior fiicrit nuracnis ;; 



AM- ,'„ 0(tf-+-^-4-2[ ; ]-\z[ \* 1-f a[ ^* -f ...4 2[ ^-^,^ ]) 

 Qiiodfi crgo wdius circuli ^Z' , qui intra crura AC ct BC 

 conllitutub acqualis lit curuac A B vocctur — r , crit arcus 



