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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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ANGUL A R FBVS.
4. Si Angulus A Sc Graduum 60, seu 3 Recti: indeque demistae C, F, anoulos
Cap. VI.
ad Balin (. protonsalail) Laclati p  asemo. Le (ut prius) criangula
XGC, FSD, sunt ipsi CDB similia; _ CF e triangulum Aiquilaterum, (cum
illis plus minutre communicans, prour tuerine in criansulo exposico anguli ad
balin:) Balisque B = 1 f d - p (seu r = p. f. 8.) FrSO,
B. C:: C. ~
B. D:: D. S
(C9 = B+.
EEF= D9 =B5. E
B. C:: D. F,  C = _. ) CCD = BH. )
Fx propterea C9 F Dq = CD = B, f BS- B, = B inca 1 5 - 1 =) B, = Bg HIOC Ct,
Duadratum Basis, ansulo graduum 60 subtendentis, Squatur Quadraris Cru
rum, dempto corundem Rectaneulo.
Nocandum hic; quod per n incelligo balin crurum C, G; per S, batin crurum
D, F; per u, balin crurum G, F; _ per B, batIn CruITUI C, D; Ouxe SeMPEF
Xqnat n L S Fu, utcunque partes lae immisceantur. Et quidem, pro +u (ubi
angulus A elt obcutus) res est conspectui masis obria: Sec, Pro -V. (ubi A ClB
ACuTUS) res aliquanco est perplexior, e consideratione indlisens: Sed utroque
catu pariter vera. Nempen pro A obrulo, B = 1 f d F H: Pro A acuro, n + 5-u:
5. Si A sitc gracluum L35,
seu Z Recti. FF G, F, (ductae ut
prius) ansulos ad balin taci.
anc ipsi a aequales: Priangula
nGC, FSD, erunt ipli CDB
similia: EF OFP. A. quicrurum;
cujus anguli ad Balin sunt gra-
ul. 2sB Ot1 11  1133
15
duum 45 (180 = 235:) Adeoque angulus in Vertice (quem V appello) cradu-
um 90 (= 180- 45 = 45.) Lt prOpterea (Per S 2) H 4 = 269; d e = C V 2.
EL Balis B = n F d  V. PN5D. , l cis lo custicton inpitor s t
B. C: C. X.
B. D: D. 5.
CC9 = - BK.
C ee dB9 =B5.
B. C: D. F = C. 3
DCD = BC
(CDVZ= = BV.
Ex propterea, C9 + D4 F CDY 2. = B. + Bd. + B, = B in (+ S. + p =)B,  b9. Hloc elt,
duadrarum Basis, subtendentis Aneulo eractuum 135; Squatur Duadraris
Crurum, Ona cum corundem Rectaneul in Y2 ducto.
Dddd