Full text: Pergaeus, Apollonius: Apollonii Pergaei Conicorvm Lib. V. VI. VII. paraphraste Abalphato Asphahanensi

0241-01

229. Notæ in Propoſit. XXI.

QVoniam G B ad B I, ſuppoſita eſt vt H E ad E K, & c. Quia L B
ad B G ex bypotheſi erat, vt M E ad E H, & inuertendo G B ad B I
erat vt H E ad E K; ergo ex æqualitate L B ad B I erit vt M E
ad E K; & per conuerſionem rationis B L ad L I erit vt E M ad M K.

229.1.

a

Et propter ſimilitudinem duarum ſectionum N L ad A I, nempe L O
ad O I eſt, vt P M ad F K, nempe M Q ad Q K, & c. Quoniam duæ ſe-
ctiones N B, & P E ſimiles ſuppoſitæ ſunt, & axiũ abſciſſæ L B, M E, nec non
I B, K E ad latera recta B G,
& H E proportionales ſunt; igitur N L ad A I eandem pro- portionem habebit, quàm P M ad D K: & quia triangula N L O, & A I O ſimilia ſunt pro- pter parallelas N L, & I A, pariterque triangula P M Q, & D K Q ſimilia ſunt; igitur L O ad O I erit vt N L ad I A; pariterque M Q ad Q K erit vt P M ad D I, ſeu vt N L ad A I: & propterea L O ad O I erit vt M Q ad Q K.

229.1.

b
Cc 2 0241-02
Figure 1. Cc 2
ex 12.
huius.

Et ex æqualitate L O ad
L B erit vt Q M ad M E, ſed
L B ad L N eſt vt M E ad
M P, cum ex ſuppoſitione
ſectiones ſint ſimiles, & c,

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