Archimedes - Archimedis De iis qvae vehvntvr in aqva libri dvo

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76ARCHIMEDIS

Ex quibus perſpicuum eſt lineas omnes ſic ductas ab
ipſis ſectionibus in eandem proportionem ſecari. eſt enim
diuidendo, conuertendoque cm ad mb, & cf ad fb, ut
ce ad ea.

LEMMA III.

Sed & illud constare potest; lineas, quæ in portioni-
bus eiuſmodi ſimilibus ita ducuntur, ut cú baſibus æqua-
les angulos contineant, ab ipſis ſimiles quoque portiones
abſcindere: hoc eſt, ut in propoſita figura, portiones h b c,
m f c, quas lineæ c h, c m abſcindunt, etiam inter ſe
ſimiles eſſe.

D_ividantvr_ enim ch, cm bifariam in punctis p q: & per
ipſa ducantur lineæ r p s, t q u diametris æquidiſtantes. erit portio-
nis b s c diameter p s, & portionis m u c diameter q u. Itaque fiat
ut quadratum c r ad quadratum c p, ita linea b n ad aliam lineam,
quæ ſit s x: & ut quadratum c t ad quadratum c q, ita fiat f o ad
u y. iam exĳs

47[Figure 47] quæ demóſtra
uimus in com-
mentarĳs in
quartam pro-
poſitioné. Ar-
chrmedis de co
noidibus, &
ſphæroidibus,
patet quadra-
tum c p æqua-
le eſſe rectan-
gulo p s x:

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Scan	Original
101	43
102
103
104
105
106
107
108
109
110
111
112
113	1
114
115	2
116
117	3
118
119	4
120
121	5
122
123	6
124
125	7
126
127	8
128
129	9
130

Scan	Original
101	43
102
103
104
105
106
107
108
109
110
111
112
113	1
114
115	2
116
117	3
118
119	4
120
121	5
122
123	6
124
125	7
126
127	8
128
129	9
130

Scan	Original
101	43
102
103
104
105
106
107
108
109
110
111
112
113	1
114
115	2
116
117	3
118
119	4
120
121	5
122
123	6
124
125	7
126
127	8
128
129	9
130