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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 C ONVEROHNTIS
Condictamen Y
Omne Frianculum aequianculum est quoq
aquilaterum.
Suibdictamen.
Super eadem recta duabus eisdem re-
etis aliae duae recta singulis aequales, altera
alteri, non constituentur ad aliud punctum,
atque aliud, verticale, ad easdem partes,
eosdemque terminos, cum duabus initio du-
etis rectis lineis habentes.
Condict. IV.
Si duo Triancula habuerint duo latera,
duobus lateribus, utrumque utrique binc
es inde, inter se aequalia; babuerint
vero 55 basin basi aqualem; anculum
verticalem sub aequalibus rectis hinc in-
de lineis contentum, angulo aequalem
habebunt.
Condict. V
Triancula sibi mucuo aequilatera, etiam
mutuo aequiancula sunt.
Triangula sibi mutuo aequilatera, agnan-
tur inter se.
Productum IV.
n
ujuscunque Trianguli tres anguli
duobus rectis lunt aquales.
Demon.
c
32
PF
de
OUS
1e
ed