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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)
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DE SECTIOHTBUS
ap. Vd.
diversitate Anculi in ertue.
L. Elebris illa Pythasorae propolicio (qua est 47 F. L. x. Euclidis) de Oua-
De varia Proportione Basis ad Crura Frianculi, pro
cibus: Occationem mihi fecerune, sem eam paulo tusius considerandi. Ouod la-
2. Siu qui Cruribus C, D,
concinetur AnguluS A, SIC RC.
Etus Teu Graduum 00: de Per-
pendicularis C inde demilla
secet Basin B in duo Scementa
Frratgula hinc oriun
drato Balis, aequali Ouadracis Crurum continencium angulum Rectum:
 Duxque Fuchais aliae (prOP. 12, 23. F. L. 2.) De Excellu (SI AnguluS
CONFENES SIE OBCTUS,) de Detectu (H RCuTUS) Ouadratorum Crurum ad Oua
deatum BasIS Comparatorum: FF Propositiones aliquot in Capicibus hic anceceden.
limilia. Propter unum Aneu
lum communem; Alcerum,
rectum; adeoque Perrium ter-
eio xequalem. Ergo
da (laceribus suis delignata)
nCC, GSD, TUnE tOtI CDB
ctum est Propolicionibus aliquor hic sequencibus.
B. C.:
B. D:: D. 8.
deoq
BH
D9 =1
C9. F D9 = B, F B5 = B in (n- f 8 = )B, = Bg. HocC
Et propterea,
Leu gractuum 90.
3. Si Angulus A in vertice, sit pradtuum F20, Peu Z Recti; indeque demistae dua
rectae C, T, taciant ad Batin Angulos ipsi A aequales: Duo Prianoula n GC, FS D,
Duadratum Basis aequatur Daadratis Crurum continentium Anculum Rectum
TunE tOCI C DB limitia, (proxeer unum angulum communem, alterum ipsi A
aequalem, adeoque tercium aequalem tertio:) Cum Messeco Friangulo GF i
Aquilatero. (Proprer urrumque angulorum au Bat, Stac 6. 1 120;
ad eoque certium iem gradtuum 60.) Et Basis B = n f s f p. F r8O,
d. 5.
C9 =- Bx
(F1BOZ D9 =BSE Ft propterea
CD= B
B. C:: C. X.
B. C:: D. F = C-= H. 3
C4+D9+ CD=b1+ 65161 B in (x f d  p =) B D Lad
Duadratum Basis, Ansulo eraduum 220 subtendentis, Aquatur Quadratis Cru-
rum, eorumque Rectansulo.
4. S
ur