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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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Ua
d8
WM
ton
n
AF COLLINEATIONE.
Demonstratio mixta.
AIFeIm C.FB i CIFA, 2. rectis,
temque DFA F CiF A- 2 rectis: lubtr. comune
erit DF A. s: Ci F B. Per noule ervotar.
Scholion.
Demonstratiomere formalis esse potest hac:
Cioncipiatur C. D. Coincidere cum AB. _ manen-
ce fixo peneto communi Fi. Vertione Facta cir-
Ca id diraricari inter sc; Patebit anteriorem
partem cractus recti C F. tantundem velut a8
Cursendo divergere ab FB. ac pars posterior
FD. Quasi descendendo dirersit ab FA. Conti
MIIC. BZ.. F. D.
Condictamen. I.
Si ad aliquam rectam, atque ad ejus pun-
ctum idem, due recta non ad easdem
partos sumtae anculos ad verticem aqua-
les fecerint; ipsa rectae in directum sibi
nvicem sitae erunt.
Condiet. II.
Si 4. rectae, ab uno puncto exeuntes, angulos
oppositos ad verticem aequales inter se
fecerint; crunt quaelibet duae rectae sibi
respondentes in directum posit a
Produerum IV.
Si dux recta diversentes AB. AC.
duaS
des