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# Title: [Johannis Wallis S. T. D. Geometriae Professoris Saviliani, in Celeberrima Academia Oxoniensi, De Algebra Tractatus; Historicus & Practicus. Anno 1685 Anglice editus; Nunc Auctus Latine. Cum variis Appendicibus; Partim prius editis Anglice, Partim nunc primum editis] Johannis Wallis S. T. D. Geometriæ Professoris Saviliani, in Celeberrima Academia Oxoniensi, De Algebra Tractatus; Historicus & Practicus. Anno 1685 Anglice editus; Nunc Auctus Latine. Cum variis Appendicibus; Partim prius editis Anglice, Partim nunc primum editis (shelfmarks Leibn. Marg. 100:1/2, Stück 2; Leibn. Marg. 100:1/2)
# Folio 595, page id 851708439:0619
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C ap. 1X.
eidem IID (eu ZBD. Nam PO FFI lun parallela curpore aequales angulos
Facientes ad D Fproctuccum;) Adeogue PI =O HI. LE PEOPterCA OD = PV
=DD - OH = ID = 2 BD. Per 8 4.
. Fadem paricer ralebune, etiam si Crurum neutrum transeat per Centrum.
ladeoque nec luper Diametrum jaceat;) Ouod, pro divertis casibus, speciarim
Oltendam.
e Si MF. un Facianc ad B, ubiris Inira Circulum, Angulum NI R u: Esto 2d
Concrum Ansulus huic aequalis BCB, cujus crura sint illius Cruribus parallela.
Perque angulare punctum I, ducatur PPD diameter. Tum erit (per 55
ND. F L H = 2BD: FFAD F AF = 2BD. Ergo (Summa vel Difterencia)
M e (= MD F ND) F L. a (= L. F +AF) = (2BD F 2BD =) 2BB.
A N G UF A R FBUS.
6. Si ad punctum N in Draeto Producta, LXtra Circulum, similis FOrmCtIE
Ansulus A: Differentia duorum Arcit cm, VD = P H, aequatux
9. Similiter: Si PTEn Sc Angulus in Circumterentia: F.C, ad Centrum, cidem
timile BCB; hujusque Crura Cruribus illius Parallela: L.L L CD cancter. Lu
per 84) HD = 2BD; e n D = 2BV. L(= AB =nB) = (25D
2 B =) 2BB.
0. Idem intelligendum, Ei Crurum alterum Circumferentiam in L cansat (punctis
 Acoincidencibus; Arcuque PH eranescente; Arcuque incu n eodem
Nam e nic FIF D = 2 B
HIEn (IED =n FD) = (2BD + 2BD =) 2BB.
PFOPICKCA
2BD. I
existenre cum P n.
Simt.