) o ( m 
»S6 
GvJ 
C AB. erit FCI = C AB + ^DC & FCw = ADC , 
triangulumquc fimile triangulo nCly & tri- 
finguliim FCn finiile triangulo ADC, Sit jam DA 
= BC=äx^ AB = dy y AC=ds y KHz=dx A^ddx^ 
ddt 
CK = iy 4- ädy , eritquc CF = ds , i . Ob tri- 
angula autem fimilia invenitur 0« = 
dt 
xds 
x-A-dx 
dd ^ xdy ddt 
I j gr proinde CI = . i 4 - ■— undc 
ät xA^dx 
d t 
dx ddy ddt 
crit oH =.lkz=:dy . { — . Invenitur au- 
X dy ät 
, xdx ddt ds^ 
tcm / // = — — . i 4 — T“ -i^Fn— 
X A^ dx 
dt 
ddt 
• 1 4 ^ — > 
xA'dx .ät 
ds^A^xdx ddt ^ ^ ds^A-xdx 
ergo F/ = — - -r— • i4- — ,&Fö= — . 
xA^dx ät xA^xd 
ddt 
I — ddx] hoc eit ponendo dx^ A-dy^ 
dy^ dxddt 
pro ds ^ , orietur Fo = ddx 4 ; — . Eft vc- 
X dt 
ro Fb=:(p ,dt A* ddt^^= (pdt^,&: Ho=z7r,(dtA-ddty 
d\'^ dxddt 
czndt^ y unde (pdt^ = ddx 4- > Sc Ttdt* 
X ät 
dx ddy ddt 
=zdy^ h— —, Sit jam dt conftans, un- 
X Jy dt 
de ddt = 0 , & ang. MDA=z s, unde ADC=: dz^ 
& 
