< 5H« ) 
*nrf.Figt3 .^*V emm Seml-virctdHSy cujus dimeter Biy & wtipftn^^ 
Bum D daPHm^ ex quo cAdat mrmaUs Z>ir== v. Sit BA =y,^£=3b; 
erit aijmtio b y «^y y = v 
A C Jive a ^—^^ 'Nnnc / 
hvfajor fitzyy dncend^ efi 
tAngens verfus B '> fi dqnalis^ 
fit paralleU EB i Jin 4m em 
minor y dneenda ejt verjhs E » 
Ht n. 1 . 2. ^ 4» diximus^ 
rij^.Fig.4. Dettfr rurfus 
alius Sem-circftlfisinverptf, 
CfijHs funUa referri intttU- 
gAntwr ad RetUm di4metr§ 
paraSeUm, & eidem aquA- 
lem^ Ht in JchemAte. Denomim 
natif, fitpriits^ pmihus^C^ 
^ NB = d ^ fit aqnatio b y 
— y y =dd + V V — 2d V. 
IgitHr A C Jive a = 
c . Cum vero tn tx» 
D - 2, y 
emplo fuppofuerimus, vfem-^ 
per ejfe minorem d 5 fi ^ fit 
major 2 y, dticenda erit Tan* 
gens verfus E i fi aqnalisy 
erit para Ikl a ; fin minor ^mu* 
tat is omnibus fignis^ ducend4 
A tA C B erit ver Jus h',nt n,^.%.& l* 
Nulla autem dncendaeffet Tangens^ fen Tangens foret ipfa EB, fi fup^ 
pofuifemns NB <equalem femi-diametrt, Jive zd^b-^ utn, $. 
F. Fig. 5. Sit tandem alius Semi-cireulfts^ cujus diameter NB nor 
mat is fit ad rejkam BEy ad qpiam ejus pun5fa referri intelligantfir, NB 
dicaturby & aliis partes denominentnr ut fupr a > fiet ty^quatio yy = 
bv-vv;^a = ^' \"y Jam fib fit major 2 v, Tangens ducenda 
grit verfits B % fi minor ^ verfks E '> fi amem Aqnalts , iff a 'DA erit 
Tangens ; mn,\.ip,& 5^°. 
Et h£c efiy nifallor^ Cafuum omnium varietas^qtuex t/£quAti$num 
sonfideratione deprehendipotefi. 
^uomo^overo ex doSlrina Tangent ium conftitffAntf^r t/£quationum 
Limites^ non efi ut pluribus exponam, citm evidens efe exifiimem,maxi^ 
mam velminimam applicatarum vel utramque fimul determinari a Tan^ 
gente paralleU ; de quo & alias ad Te ftripfi^ & aliqnid etiam attigi 
/ 
