Marci of Kronland, Johannes Marcus
,
De proportione motus figurarum recti linearum et circuli quadratura ex motu
,
1648
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grad. 45. ſemiſſis nimirum anguli AOF: Si ad huius logarit
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mum addatur logaritmus lateris BF, erit aggregatum logarit
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mus lateris FG, ſeu BF partium 7653668. </
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<
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>Quot nimirum
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partium erat quoq, chorda AB, hoc eſt illi æqualis BF. </
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ſi
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ducatur ex G termino motûs linea perpendicularis ad
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BF, ſecabit eandem in puncto F: ac proinde motus ex B in G
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eſt æqualis duratione motui ex B in F per prim. </
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huius.
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motu communi ex A in B, lapſus per duas chor
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das AB. BF æquatur lapſui per chordam AF: qui per prop. 15.
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erat æqualis duratione lapſui per chordam LF ſeu AG. </
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ALITER.
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<
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>Ducatur ex F perpendicularis ad BF: dico hanc productam
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ſecare BG. in G. quod ſi non; ſecet ſi fieri poteſt, in alio pun.
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cto VG: X vel Z. </
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<
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>Et quia angulus externus NOL eſt grad:
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45. erit angulus OLF internus grad: 22. prim: 30. & angu
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lus OLA grad. 67. prim: 30: propterea quod LOA ex hy
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potheſi ſit grad: 45:
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OLF ex OLA, reſiduus FLA,
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hoc eſt illi æqualis FGB grad: 45, ob parallelas nimirum &
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æquales FLGA. </
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in triangulo FBG rectus ſit an
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gulus ZFB, & angulus FBG per lemma huius grad. 45: erit
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angulus FZB grad 45, ac proinde æqualis angulo FG
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B, externus interno: quod eſt abſurdum. </
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ea
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dem ratione probabitur linea AG non ſecari à perpendiculari
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XF. </
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>Aſſumatur rurſum arcus AC grad 67; & CF grad 23. pro
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ducatur autem AC in P ſumptâ AP æquali chordæ perallelæ F
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M. </
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in F excitetur linea perpendicularis ad FC:
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dico protractam ſecare AP in P. </
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>Quòd ſi non; ſecet, ſi fieri
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poteſt, in alio puncto V. G: I. </
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<
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>Et quia angulus FCI per lemma
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huius, eſtgrad 45 erit
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angulus FIC grad 35 Exæquatur
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autem angulus FMA angulo FPA ob lineas parallelas, & </
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