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Philosophiae Naturalis Principia Mathematica

by Isaac Newton

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Prop. XXVIII. Prob. XX

Trajectoriam specie & magnitudine datam describere, cujus partes datæ rectis tribus positione datis interjacebunt.

Describenda sit Trajectoria quæ sit similis & æqualis lineæ curvæ DEF, quæq; a rectis tribus AB, AC, BC positione datis, in partes datis hujus partibus DE & EF similes & æquales secabitur.

Age rectas DE, EF, DF, & trianguli hujus DEF pone angulos D, E, F ad rectas illas positione datas: (per Lem. XXVI) Dein circa triangulum describe Trajectoriam curvæ DEF similem & æqualem. Q. E. F.

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