Vi. 
( V79 ) 
In Parabola pauIo* fim- 
plidor adbuc evadit ‘ 
conftrudio. Nam quo; ' 
niamex natura Para- 
bola eft S A ^ S Kj Sc 
ang. A-KH redus, e- 
rit S centrum circuli 
per A K H tranfeuntis, 
unde invenitur Radius 
curvaturx producendo 
S AinH, ut SH=SA, 
8c in H erigendo per- . ^ 
pendicularem M R i Et-R ent centrum circmi olculantis 
Parabolam in A. 
Vis Centripeta tendens ad focum Sedionis Conicx in 
qua corpus movetur, eft reciproceprpportionalis quadra- 
to diftantise. Nam quohiam " ' " ‘ ^ 
LxSA^ . SA 
AR~ — ent 
2SP? 
S A X 2SP5 
SP3 X ar 
2 - 
“'SP^xE’^SA^ LxSA^ 
2 
hoc eft ob datam ^ ent vis 
I 
centripeta ut 
Sit EUipfis BADquam'tan- 
git in A reda G E.^ 'Sintque 
S P per centrum Elliplis 6c 
KA per contadum, tranfe- 
untes, perpendiculares in tan- 
gentem. Erit S P K A = 
quartx parti figurx Axis feu 
= . quadra to femiaxis mi no- 
