Full text: Libri I - III (1)

360 
ELEMENTORUM 
II POTA2IZ X. 
Ev voig loois xuxhois ai loat evdeiat loag neoi 
qeocias apaioovoi, voy nèv nelgova vy neigovi, vyy 
de čdovrovg vý ělavtov. 
EovooaV looi xuxhoi oi ABT, AEZ, zol èv aù 
rois loui evdslai éorwoav al BT, EZ, rès pèy 
BAl, EAZ neoioeocias neiçovag agaioovoai, rès 
de BHI, EOZ ěviovag; léyo ôvi  pèv BAI 
weigov neoioéoeie loy korl vi EAZ pelçovi negi 
peosia, » de BHI àdvvov neoigéoeia v EOZ 
αvTOv. 
Eimodo yåo ra zévroa v6p zUxhov, vo K, A, 
zal karegevydwoay ai BK, KT, EA, AZ. 
(adeoque ZA, O1) parallelae sint, erit IH—KA, et ze 
Al (I. 34.) adeoque KA—KA+Al-TA—IH-ZO--TA. 
Cor. 5. Si (Fig. 258.) semicirculus AAEH (qui in Cor, 
praeced. in numerum parem partium aequalium quemcunque 
divisus fuerat) iam dividatur in numerum imparem partium 
aequalium quemcunque AB, BI', TA etc. et ducantur per 
puncta aequaliter a diametro distantia rectae BO, TZ etc. quae 
inter se et cum diametro AOH parallelae erunt (Cor. 1.), et 
ad extremitates eius harum parallelarum, quae a diametro AH 
maxime distat, ducantur e centro O radii O4, OE, summa 
rectarum 89, ye, BE, quas hi radii e parallelis intercipiunt, 
aequalis erit radio 40. Nam rectae 40, EO productae ad 
M, N, ob angulum MON=AOE (I. 15.) arcum MN=AE 
abscindent (III. 26.). Ductis deinde per 4, T rectis 44, 
T'K etc. parallelis rectae EM, abscindentur arcus MA, AK etc. 
aequales arcubus AE, 4l etc. (III. 26. Cor. 2.) et, quum integer 
semicirculus MAE aequalis sit semicirculo AAH, adeoque tot 
arcus aequales inter se, et arcubus AB, Bl' etc. contineat, quot 
habet semicirculus AAH, reliquas etiam arcus AK aequalis 
erit arcui Bl', adeoque ducta BA parallela erit rectae l'K.
	        
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