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# Title: [Lectiones XVIII, Cantabrigiae in Scholis publicis habitae] Lectiones XVIII, Cantabrigiæ in Scholis publicis habitæ (shelfmarks Leibn. Marg. 0; ZEN Leibn. Marg. 0)
# Folio 69, page id 797435492:0113
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10 LX
L.. T. N postrema Lectione quod spectarimus punctum cireuli convexo
Lalluxir; nunc parres concaras irradians aliud, at magis et n’no,
concemplabimur. x quidem casuum pexecipuorum diverlicatem im
primis distinouemus. Nempe radiet punctum A in circulum re-
Aectentem, cujus centrum C; connexaque recta AC protendatur in-
detinire; quo posito.
II. T. Incidat radius A N; _ TIF A N = AC; erir ip(IuS AH
rehexus, puta N a. ad A C parallelus.
Hoc e tupra generatim ostensis constar; ec Facile jam paret, Con-
Nexa C A. etenim est aiig. A CN = ANC; Ob AC, AN, Cx
Hypothesi pares; _ ang. AN C = ~ NC; proprer reflectionem;
ad eoque ang. AC N = a N C; unde sunt AC, Na libi paralle
IX.
18. 970r
III. 2. Incidarradius A M major ipSa AC; ejuS resexuS (puTA F18. 98.
M a) cum aze directe procedens conveniet ultra centrum, respectu
puneti A; Choc. est cenrum C puncto racianti, concur suique inter:
Jacebic):
Nam Ob AML AC, CPIF anG. ACME AMC =CMa.
ergo ane. BCM 1 CM a 3 anG. BCM-F ACM -= 2 rect.
quare M a, C B convenient intra C.M ad partes a B; velur.
ad R.
recterus, pura Ra, axi retro procractus occurret. (hoc est ut radians
cenrro, concurtuique sic interjectum).
Nam hic ob A R =n AC; exit ane. A C R  ane ARC- an.
aRC. QuaprOPTEY anS. DCR-Y a RCL 2 rect. unde paret ip (a5
DC, a R Porrrnctas intra C R COnCUrreTC:
8. 99.
V. ElOrutad..