Barrow, Isaac, Lectiones opticae & geometricae : in quibus phaenomenon opticorum genuinae rationes investigantur, ac exponuntur: et generalia curvarum linearum symptomata declarantur

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Lect. VIII.
III. Dico fore AC. AN : : KC. KN. Nam ducatur KH ad
CN
parallela.
eſt igitnr ang. KHN = CNP = CNK = NKH.
hoc etiam è ſuperiùs generatim oftenſis conſectatur. adeóque NH
= NK.
itâque cùm ſit AC. AN : : KC. HN. erit etiam AC.
AN
:
: KC. KN.
IV. Corollarii loco notetur (ductâ CP) fore NH = NK;
& triangula HNK, NCP aſſimilari; vel eſſe HK. HN : : NP.
CN
.
V. Porrò, conftantibus iiſdem, dico fore AC. KC : : ACq
-
ANq .
CNq. Nam eſt NP. CN + AN. CN = HK.
HN + AN. CN = HK x AN. HN x CN = AN.

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