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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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TI8
DE CONVEROLNTIS
veantur, vertus le mucuo; tune
 amba linul minores unt ter-
tia: tandem concident cum ter-
tiahine inde, relicto intersticio
interse: Sed E aequales fuerint:
coincident cum tertia, libi vero
conterminabuntur; d le mutuo
attinsent: ln majores tuerin
tertias conterminabuntur extra
certiam, Facientque Triansulum
rectilineum.
Demonstratio
Formalis patet ad oculum de corporis et
mentis, in Figuris 19. 20. 2r. Si principiamate
rialia pro demenstrandi mediis achibeas; per-
cranseundae cibi sunt plusquant 20. propolitio.
nes, donec commode hanc veritatem contir-
mandi locum nanciscaris.
Productum II.
Cujuscunque Trianguli uno latere
producto externo angulus ACI
duobusincernisremotis (alterne
BAC. _ OpPOLItOABC.) xqualis
5
Demon