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
71	39
72	40
73	41
74	42
75	43
76	44
77	45
78	46
79	47
80	48
81	49
82	50
83	51
84	52
85	53
86	54
87	55
88	56
89	57
90	58
91	59
92	60
93	61
94	62
95	63
96	64
97	65
98	66
99	67
100	68