>^- 



i^ ) 3^^ ( r?3- 



dabitiir anguliis MPF, hincque fupcr MF dcfciib.uur 

 fcgmcntum circuli quod anguli ^MPF capax ell , rccla 

 N M producfla ifli fcgmento occurrens in P, dabit lineam 

 F P idcoque axem A F B ipfi F P pcrpcndicularem. 



§. 3<?. Si vt fiipra ducla intclligatur reda DH 

 normalis ad DB, quac MN producftae in Q occurrit, et 

 MI produda concipiatur vsque ad G , tumque iungatur 

 rcifla Q F, erit Q M : G M — P M : I M ct 



G M: M F = I M: M m= i : e; 

 hinc ex acauo Q M : M F — P M : M w ex quo liquct 

 rcd;mi QF fore ipfi PR parallclam cc normalcm ad FL, 

 vndc dabitur punctum Q. Porro erit 



M IM I_n ^l^jn I FM 



hincquc GM— ~, vnde.ifta deducitur conftrudio, fupci 



QM dcfcribatur fcmicirculus, in quo aptctur GM:MFi:i:^, 

 inucnictur fitUb axis principalis duccndo pcr F lineam 

 D B ipfi G M parallclam , atquc hacc quidem conftru- 

 <ftio illa a iXr^^lono propofita aliquanto facilior cflc vi- 



dctur. 



§ 37. Opcrac prctium nunc quoquc crit, vt o- 



flcndamus quomodo Analyfis noflr:! in fiipcrioribus §. 7. 



alhita, ad hanc pcrducat conftruclionem. Quia igitur ibi 



Y\n 3 habebatur tang. j/ — tang. 5. ^-—^ , adplicationc ad no(kam 



Figuram fada , erit 



cot.LPR = cot.;(FMN-FNM) 



rrtang.MFL';4:!:-^j;4i, 



hinc L P R — 90 - ?/. Poiro quum Ct 



-cof. 



