Si mid forte ftt ohfcHritatis in Regula,,^%^^^ exemfUs ilkBraiitfir: 
D A , & qu^mf ' a - five A C talis j m jMntta D C tangat Cur- 
wm hilin D. £^x-regula, nihil rejiciendm eB abhac i^qmtione^-^ 
chm in Rnmlis e'jm fartibm reperiatHr y vel v. M qmque difpojita efi, 
ut ab md latere pt'omnes illim pmes in quibm ab alperOy Omnes 
'in quiym m ^ Sffmlifitaqne tantum pr^figendm efi Exponem pmefiatis, ' 
amm imll^ babef y vel v ^ & in latere ftniftro mum y vertendHm in a. 
m fiat b a - 2 y a i^ z v v. Ajo nmc , hmc ^qmtionem ofiendm 
modum ducend^ Tmgemis dd punBum D, five a-±= ^ =s A C, 
Sic fi data fHerit ceqmtio q q + b 7 - y y = V V ; eadem pUnefieret 
c^r^ priori ^.qmtio pro Tmpnte'^^je^o fciU^ q,ut ReguU pr<efmhit, 
Sk ex z b J tMlMMM! ^ -i^.?.-:^ 3 V ^ a = 
3JLi 
.= zq V v ^ a=ff|fe;,> £^ b'*+ by '-y> = qq V vtzv3, 
fit 3 y y 2^ - 4. y It ? p 2. q q V y T S'Z V ^ 1^ a = tTTTnriT^. 
Vermin fimilibu^'^^qtiMlon^ mlUm arbitror accidtrepojfe dificul- 
mem. - AliqHdfortaffe in illis occurrtt, quarum partes qmdam confim 
>ex prodfiBis y in v> / Vt y -v,. 7 y v - y ^ vv, &v. S ed h^c , qmcjm 
Levis efi, ut eXempliff^peiit. Detur enim y 3==; b v V -.'y v r. NiM 
'd illa reficiendum erk.cum injmgulis ejus partibm reperiatnr y W V. 
Sedutex ReguU prSfcripto difponatur^ bis fumendtim erit y W, & 
flmendtmtar/^in Utere dextro^ inqmfmt partes qua habent Yf q^m 
infim[iro, cMjm partes habenr y \ quandoquidem^ V Vy tam y quam-'f 
fmuneat-r ,:¥^€imdHmigitw^^ ^-r— * 
y*-t^vvy = bvv-y V>. 
■ Tummntma^ m prihs.hac^quationeindiam 3 y y at vv a =:zb vv 
2 y -V V, aabitur a c= 3 ^ y ^ r ^"o 
/^^ ^f^/;^ fntellig^ndA efi Regula , //f , tof ^^i? hqh cenfideKctHY 
^pHeftas ipfiusc^^^, iJeeque ipfi y v v Exponens W prafigi nan debe^t^ [ei 
tsnthm ipfius^y Si cut contra ab alio latere-^ in y v v confiderarippn 
bet pQteftas ipfius y , fed v tanthmy^ eiqwe funs Exponens prapom* . Sic ft 
fsret y ^ t b y ^ = 2 q q V ^ ~ y y v 3 ^faciendum epty^'^by'^ t V.^ y y 
't^ z q q v;^^ y y v ^ ^ ^ /C^ haberetur aquatio pro Tangente 5 Y 
• -t 4 by 3 V ^ y a = 6 q q v ^ 3 y y v ' ^ a = -^t^^"^^^-' 
At^ue his Exemplls arbitror, me mnem, qu^ darl pofet^ Cafum 
varietatem comfkxum ef ? . C liter un^- non erit fortajfeinmilei fi 
reneratim exfofd, ad line am siiquam pngularem apflicem' ^ D^t^ p 
IgiturCur-va BD, cujus ea fit upropri etas, ut fumptojn illaqmtikt 
im^ioB.^ ft junfMur -B D, & erigatur -ad ilUm mrmalu BE\ ocm' 
'rem relu B E inE t ^^^^ ^ ^ fit fempsr ^qmiis dat^ r-eB^ B F. 
