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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
SECTTOHEBUS.
Cap. IX.
2F. Similiter: Si ONX Sic Angulus Fxera circulum; ejusque Crura Circumse.
rentiam secent in P r. Sicque ad Centrum Angulus similicer sIcus BCB: e
VFD diameter producta. Fum (per 56,) OD = PF = 2B
=2BD. ErgO, OD =XD, dempris P F F n F, aequabun 2BD = 2
d
l
D = 2BB.
cer, sed Fansat. Nam cum, punctis P Q, auc n X auc ucrisque, coincidenti
buS; CxTCrA PTOCCdEHL uE PriuS. Nam etiamnum OD - P F = Z BD; et XB-
nF = 2BD. L130(summa ret ditterencia) QX P n = ZBB.
22. Idem intelligendum elt li Crutum alterum vel vcrumgie C Heutum non Se.
leurite
23. Sed, S Crurum alterum, vel ucrumque, Circulum transeat, (eum neque
secans, neque tangens;) Id ad praesens negorium non spectat. Ouippe talis An-
sulus non infiltic arcui Circulari
Oux itaque particulatim ostenta sune; huic Generali aequipollent:
24. Si Circulus secetur (AULTANSaCE) duabus Rectis, angulum facientibus,
(adeoque, S contmmentur, se muruo deculsancibus:) Segresatum (h Interlectio
lic Tnera Circulum) vel Differentia (R EXera) duorum Arcuum ipsis (A OpuS,
productis,) interceptorum: vel (B incerlectio sic in ipta Cireum ferentia) Arcus
unicus ipsis interceptus; Aquatur Duplo Areus intercepri Cruribus aneuili a-
quasis ad centrum posit. (L . (1 E 5= CL i 15 siit 1B
 . L Cl e)
Libet hic subjungere Responsa mea ad Problemata quaedam ex Callia de Beleio
ad Societatem Recram Lonaini missa; quae ee ipla Circulares AreUS respiCILnE.
Non quod ea sinc vel magni (quancum rideo) momenei, vel masna disticulta-
tis: sed quod uc calia fuerinc Societati Resix proposica; aeque ab eis mitii deman-
data; quibus obcemperandum centui.
s
1
ec
D
a
le