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# Title: Ioachimi Iungii Philos. ac Medic. D. & Gymnasii Hamburgensis Rectoris Geometria Empirica (shelfmarks Leibn. Marg. 9a; ZEN Leibn. Marg. 9a)
# Folio 12, page id 73061350X:0020
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3
q. Ad dacam rectam interminatam AB, ex dato ex
era cam puncto C, perpendicularem rectam demitte.
EC.
CentroC intervallo ad libiti defcribatur peripheria, se-
cans daram AR, in punctis DecE. Deinde Ccneris D e P, ad li-
birum concuriant a quirrdia peripheriae in PCCireineadem
Plasaim qud elcnere in dirersa) Ducta recta Cti exit perpe-
dicularis desIdersEa.
HI. Si in dirercplga concurtus tane, unica diraricario-
neconltructio ablolritur.
Constructio alia. Si cata sic recta AB, ec darum pun
etum C. V. 8. Luprarcetam AB; tumanturin recta AB puncta
D. E, ad libicum. dein incerralioDC, centroD intra iplaire
AB, ducacur arcus FC; itcnr; incerrallo FC, centroF in-
Fra iplam AB delcribatur arcuS FTBarCum FOSccanS inK, Du
eta recta C. R Sccer rectam AB in L, eritgi C L perpedicularis
desiderata.
H. Commodus exie hic modus, si puncta B e C. sinc in
extremoplano.
8. Superdatam interminatam rectam AB, ex dato
in capincto Cperpendicularem excitare.
Cenero C, interrallo ad libitum deleribatur periphierias
secaris daram AB in punetisD ScF. Deinde ceneris D, F, in-
cerrallo ad libicum, concurrane aequiradix peripheriae in
F. ducta recta FC, erit perpendicutaris desideraca.
Aliter. Posiro cruremobilicircini in C, ponatur alte.
lextra datam rum crus ad libitum in cenero D, ita tamen, ue peripheria
delcripea lecer datam AB in duobus punctis C. _EF. DuCaeuF
E.D delcriptam peripheriam ecans in P. ducta recta C F, crit.
perpendicularis deliderata.
COrOII. Norma itaque examen hinc manifestum est; nimirum (
constructo anculo re ctomormaminterioribus, cum exterioribus late-
ribus coneruat: vel si costraeto semicireulo apice normae vel exteriore
ovelinteriore occupante punctum aliquodperipheria. latera sive crura
orma apiei respendentia pertermines dimetritranseant. dd