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# Title: Francisci Dulaurens Specimina Mathematica Duobus Libris Comprehensa (shelfmark Leibn. Marg. 134)
# Folio 212, page id 1066520976:0232
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212 SPECTMERUM MATHEmaLdONuM
recta AB, _ C D C diamerri cerminis prodeunt ad diret-
las parres. 2us quando ipla ex iildem cerminis eltuta
lune ad eandem parrem, se se muruo interlecances. VIe
mus autem quance eela linea non se incerlecant. L10
cribusaucem atolo Caceca.
PRAPARATIO.
DRMONSERATTO.
AB H B I EX CITCMLInaTTA A CH S∞y = d a
BC HIC
CD II d ee BD HI Nyy = b6I, AC verd C in
AD IT y Prima Scura) (C AC X BD II)
+Yg4 = bby2 + b2 d2) (C A B
d a
XCDH) - F bd H (a AD X BC HI)-+ cy. Ouare
+ cy - bd AV ga = bby3 - + b2 d s, e Con(CqUenEEK
dd
+ c292 = 2bcdy- + b d HI- + 14 = b bp- F b2 d2.
Tgitux - + y3 -- bby - + 2 bc d HI 0.
 Cc
dd
da
Vel (ur in 2. fic. ) (CACX BDHI) + V yt - bby3- + b. de
dd
=+ (C ADXCBM) CyMI (A AB XCD H) -+ bd.
Er5O - + b d = cyHI Y 9t = bb9 + b. do s. F580
da