Vitruvius - De architectura libri decem

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308276LIBER109[Figure 109]Figura ex meſolabio Architæ ad inueniendas medias.c t @ @ q p o n m l k l h g f p e o ξ v M @ k I o h j ε δ r B d s R q P o N M L K I H G F E L x c 6
N ς ε ξ γ B a

Nunc ueniam ad Platonis inuentum, demonſtrationemq́; & inſtrumentum eius afferam. Coniungantur in
b. ad rectum angulum duæ rectæ, inter quas duæ comparabiles, ac rationeres pendentes medias uis inuenire.
Es̃to b g. maior e b. minor, utraque uero extra angulum b. producatur,maior ad d. minor ad c. &
ad duos rectos angulos unum in c. alterum in d. in ſuis reſpondentibus lineis, es̃toq́; angulus unus g c d.
alter c d e. Aio inter duas datas c b. & b g. eſſe duas medias comparabiles inuentas b d. ſcilicet,
& b c. quoniam poſuimus angulum e d c. rectum, & c d. æque diſtantem ipſi c g. ideo ſequitur
ex uigeſima nona primi angulum g c d. rectum eſſe, & æ qualem angulo c d e. quem ſimiliter rectum
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Scan	Original
111	79
112	80
113	81
114	82
115	83
116	84
117	85
118	86
119	87
120	88
121	89
122	90
123	91
124	92
125	93
126	94
127	95
128	96
129	97
130	98
131	99
132	100
133	101
134	102
135	103
136	104
137	105
138	106
139	107
140	108