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# Title: Erhardi Weigelii Sacrae Caesar. Maiest. ut & Com. Pal. Sultzb. Consiliarii, Supr. Artium Archit. Directoris Saxo Ien. Mathemat. PP. totius Academiae Senioris, Philosophia Mathematica (shelfmarks Leibn. Marg. 65; ZEN Leibn. Marg. 65)
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DE BTRECTIOHE
dens anculos alternos, aut oppositos,
aquales facit; parallela sunt illa duae
recta.
Condiet. III.
Si in duas rectas lineas altera recta inci-
dens, internos ad easdem partes Llos
duobus rectis minores factat; duae illae
rectae linea in infinitum productae sibi
mutuo incident ad eas partes, ubi sunt
anculi duobus rectis minores.
Condict. IV.
Duae (AB. CD) Fis. 16. eidem recta linea
(E F) sunt parallela; e5 inter se sunt
parallela.
Productum VI.
ReCta AB, planOFC. DF. Fig. 17.
transverlalis, licet uni rectx plani
eh. Derpendicularis (E; obliqua
tamen elle potest ipli plano.
Demonstratio.
Licet enim recta AB perpendicularis sC
rectae (Sr.) Sicut norme erus extans subjecta
basi suxe, per hypoth. Fac normam AB eh, ri.
idam in se circa veltisium baseos (str.) tam-
qulam circaarem in plano hincinde vacillare;
Dex vOlTUIaEUM XGUIEatIS; inclinabIEuT AB.
CTUS
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