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# Title: [Philosophiae Naturalis Principia Mathematica] Philosophiæ Naturalis Principia Mathematica (shelfmark Leibn. Marg. 166)
# Folio 86, page id 1041163592:0120
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86
PHITLOSOPHLE NATVRALIS
 Moro dem recta per medium omnium F.g, e  M K; (pEF LCM. XXKTL)
Conrenon ec medium rectae M K est centrum Sectionis.
PROPOSITTO ZEVII PROBLEMA ZIX.
Trajectoriam describere quae rectas quinque positione datas continget.
Dentur positione tangentes ABG, BC F, GC D, F DF, F. A.
Figurae quadrilaterx sub quacuor quibulris contentae AB F P dia-
gonales AF, BF bileca, _ (per C OrOI. 3. LCM. XXV) recta NN
per puncta biseetionum acta cransibit per centrum Trajectoriae.
Rurlus Figurae quadrilatera BC D E, sub aliis quibulris quatuOE
cangentibus contenta,
diagonales (ut ita dicam) B D, G F Bi-
seca In F et G: e recta P a per puncta bilectionum acta trans.
ibic per centrum Trajectoriae. Dabitur erso centrum in concurtu bi-
secantium. Sit illud O. Tangenti cuiris BC parallelam agc K L,
2d eam emnciam ue centrum O in medio inter parallelas locecur.
et acla Lanset Trajectorium describendam. Sccet hxc tan-
debbu