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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