[ r 95 ] 
[ Fig. 3* ] cujus Iatera refpedtive tangant ellipiim 
in pundtis P, Q, R, S, T a V, Sec. & erit contentum 
/Px ? OxrR X i Sx/Tx <uV &c. = Py x 
Qr X Ri xS/x T x V w x &c. 
Cor. Ducantur lineas PQ, QR, RS, ST, &c. & 
pro finibus angulorum WP/, QPy, RQr, QR r> 
SRj-, TS/, &c. fcribantur refpedtive a, p, b, q, c, 
r, d, s, Sec. & erit 
abed Sec. — p q r s Sec. 
Et fie de polygonis inter conjugatis hyperbolas in- 
feriptis. 
Idem verum eft de polygono, cujus laterum fum- 
ma vel area minima fit, circa quameunque ovalem 
in fefe femper concavam deferipto, ut conftat e noflra 
Mifcell. Anal. 
T H E O R. IV. 
. SIt ellJ pfis PAQBRCSDTEVF,&c. [Fig. 4.] 
circa earn deferibantur duo polygona abedef, Sec . 
pqrstu. Sec. eundem laterum numerum habentia; 
eoium Iatera ab , be, cd , de , e f, Sec. p q, yr, rs, sf, 
tv. Sec. refpedtive tangant ellipiim in pundtis A, B, 
C, D, E, F, &c. & P, Q, R, S, T, U, &c. & fit 
a A : Ab :: pP : Py, & : Be :: yO : O r & 
cC : C*/ :: rR : Rs & dD : De :: sS : St, Se fic 
deinceps. Et area polygoni abedef Sec. squalis 
erit ares polygoni pqr s tv, Sec. 
Cor. Duo parallelogramma ( abed Sc pqrs) circa 
date ellipfeos. conjugatas diametros (AC Se BDj 
FE, QS) [Fig. 5.] deferipta, erunt inter fe asqualia. 
C c 2 
In 
