ac proincle A R = ^ - — . Eodem prorfus ratiocinid 
Invenietur Radius Ciirvaturse in Hyperbola sequalis 
4 A K 5 L X S AJ ■ ■ 
L 
O 
Spj 
In Parabola vero facili- 
or eft calculus. Nam ob 
clatam fubnormalem, eft 
K k femper = AT=Fluxi- 
oni Axis 5 & trianguia 
k^^m,ato,spa, akl, 
sequiangula, unde KM: 
K X’ : : A P, S A, item eft 
AT velK/^:AO::AP:SA, 
unde KM : AO : : A P » 
:SA^•:SA^ — SP^:SA^;; 
unde erk S P S A" : : AO 
-KM: AO ::AK: AR, 
ac proindfe AR — . 
: SP^ ’ 
fed eft AL ~ i lateiis Re61:i = i L, & AK ; AL ; : SA : SP, 
. l;;sa 
quare erit — 
^ 2 AK 
4A KJ 
X S A^ 
rit X R 
erit A R = • 
L-S A^ 
2 SP5 ' 
'S P) 8c S P^ — quare e- 
vel quoniam eft, A K = — ^ ^ 
2SP 
Atque ex his faciftima oritur conftru(ftio, pro determi- 
nando Radio curvaturx in qua vis Sedlione Conica. ^it 
cnim A K pcrpendicularisin Seftionem occurrens Axi in 
K, ex K fuper A K erigaturperpcndicularis H K, cum 
A S produiia 'concurrens in H. Ex H erigatur fuper 
A H, perpendicularis H R,'erit A R radius curvature. 
In 
