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# Title: Leibniz-Handschriften zur Mathematik LH 35, 13, 3 (shelfmark LH 13, 3)
# Folio 49r, page id 00068200:0099
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us profedsionis ad invenitnda tercoremasus
et roblematum soli
n
per projectionem sectionum
consi in plano baseos
desolodi rotatione geniti si plano BCdE secetur cong. AFG. Catus
sectione
per plaum vertex A. basis circulus FG. patet
ct lucido in A collocato sectionis
projectionem seu umbram esse basi
in plano baseos esse ipsam basin
adeoque hoc loco circulum.
Hinc sequitur: omne problema quod solvi potest
intersectione rectae et Sectionis Conicae esse planum
Nam projectio sectionis conicae est circulus seu basis,
projectio rectae est recta. Itaque  constructionis
per sectionem Conicam et rectam projectio
in plano baseos, erit  constructio per circulum
et rectam, itaque punctum quaesitum in plano
baseos habebitur intersectione circuli et rectae.
Pono autem dato puncto in plano sectionis dari
po idem punctum in plano baseos et contra.
Hinc patet et cur dangeatis tangens sectionis
Conicae plane haberi possit. quia tangentis projectio
etiam est tangens sectionis (onicae circulus, quaeritur
ergo tantum circuli turjusdum tangens. Nec refert
ex puncto dato in sectione conica an ex alio puncto
Sed minima
ad sectionem ducenda sit targens.
ad sectionem lonicam hac ratione non potest duci plane
Nam minima est perpendicularis ad tangentem, act
projectio perpendicularis fu seu anguli recti non
est perpendicularis
Vel: minimm est invenitur ex
circulus ex puncto dato descriptus
curvam tangit. sedci verum circuli projectio non est
suciltur ex puncto dato, 
circulus sed Ellipsis. per projectiones commode
definiuntur (et sectiones somicae similes eae scilicet
1
tid plure
ubi aeneralis crtemtus
danner
in scledius constinctioat de pres si
constractio et