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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)
# Folio 114, page id 79876922X:0600
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DE DIHECTIONA
lalisstribus rectis in punetoinci.
dentix quomodocungi libitrans.
verlalibus se liltar perpendica
larem; Superticies, quae capit
Lqu
hastres reclas, plana crit.
Demonstratio formalis.
Licet enim dictae rectae non sine perpendi.
culares inter se, cum nihilominus crus extans
normae prima idem, de secundae tertiaque L. C.
omnibus his cribus, perpendiculare lic, Per
tirp. promoreatur normae basis circa punctum
incidentia, ut circa centrum circuli, per postu-
latum aeguitacis: d transibie haec per omnes re-
Cias tres ex puncto incidentix progredientes,
cure altero AB necquicquam variato. ErsO
A recta tribus rectis in communi puncto con-
currentibus insistie perpendiculariter; illae
eresrecta tunt in uno eodemque plano: cum,
si non sic planum, variandum esset extans
ctus. Mmod ex inspectione Schematis realis
clarius apparet.
a
Productum 17.
Sireclabina binasrectas parallelas
dxqualesjungunt; ipla paral.
Icla _ aqualestunt.
dia
lo
d