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# Title: Leibniz-Handschriften zur Mathematik LH 35, 11, 17
# Folio 17v, page id 00068190:0034
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duo illa plana projiciens et projectionem
excipiens esse parallela, quo casu, quaerendum
est punctum radians, et distantia planorum
parallelorum t talis, ut ipsique elc
conicae sectionis projectio sit etiam circulus.
Prior via brevior esse o posterior
itam
amplior Incipiemus a Priore, us
quia ita nori est a necesse mutare rectam
A tantum aliao punctum in recta Ax
si  opus producta loco ipsius A assume attus
verbi gratia eA, retento eodem plano
projectionis excipiente seu planea
projectionis Y (1. Nam
projectio ipsius sectionis condrae slc ex a
puncto radiante 2A. dempe 3 2A2). erit
circularis priori ()3Y  patallela
ptuncta autem 2A et a in recta
Ae si opus producta ita sumi debent
ut sectio una alteri, sit subcontraria
seu ut triang ulum 2 ACF si mite sit
Miangulo 2A2G2)
M Uet autem inveniamus haec puncta
possumus diversas miscere vias progressus
aut regressus nunc haec nunc illa pro
datis quaesilis ve assumendo. prout commodum
erit, onec conditiones simplicissimas
oranciscamur. Utitius tamem est incipera
Videamus primum quid ex datis A f. d V. l. c.
educipss luci possit, ad reliquas habendas
primum ergo quia df aequi dc. Es
Dende Quia Trangulum quia triangulum 2AFC  simile
triangulo 2A22). et angulus 2A utrobique
idemteruntanguli f et 2Y. item, C et 29 aequales
per 2d ducatur: parallela ipsi fc. nempe ion
occurrem ipsi 2A2 in n et ipsi 2AE) in P. productis
si epu est. Cum sint triangula 2AfC et 2An p.
similia se opus est patet cum sint aequales afet
dc etiam 26 et 2dp erunt inter se aequales
cursus trianguta 2828n et 26p,) sunt fimilia
nee nam angulus 1c aqui angulo C. ergo et angulo p.
angutus autem n2dE8. aequo opposito 2)2dp. ergo et duo
reliqui n et 29n25 et 202) p erunt aequales.
jam duo eorum latera homologa  2dn et 25p.
sunt aequalia, ergo et reliqua aequalia erunt, seu eris
2624 aequ 2d24 et eptiaequ 2Yp aequ 28n
enim ver
sed neratcur ista probaremus patenter
ideo qura  quia itaque 282) est diameter
ejus centrum. Itaque 2A2d erit Coni 24291Y axis