Marci of Kronland, Johannes Marcus
,
De proportione motus figurarum recti linearum et circuli quadratura ex motu
,
1648
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ab
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linea hypomochlij, &
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fg
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ad eam perpendicularis:
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eritq;
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ex
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iam demonſtratis
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fg
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grauitas mouens, &
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ag
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plaga eiuſdem
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centri. </
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<
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>Et quia plaga eſt in lineâ
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af;
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erit motus reflexus in
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eadem lineâ
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af.
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quòd ſi ergo fiat ut
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ag
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ad
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gf,
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ita
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ah
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ad
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ak,
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erit
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motus medius in
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ai,
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& angulus reflexûs
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iak:
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quem dico æqua
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lem angulo incidentiæ
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oab.
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Quia enim angulus
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oab
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eſt æ
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qualis angulo
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afg,
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propterea quòd
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ſit complementum
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anguli
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fag:
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angulo autem
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gfa
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æquatur angulus
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iak,
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quòd ſi
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milia ſint triangula
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agf. iak:
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erit
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angulo
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oab
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idem
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angulus
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iak
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æqualis. </
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THEOREMA XIII.
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Motus Pentagoni ſecans obliquè planum, ſi latus, quod tangit pla
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num eidem ſit parallelum, ad angulos inæquales reſle
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ctit.
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<
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>Motus Pentagoni
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abcde
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incidat obliquè plano
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ſt
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habens la
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tus
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ae,
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quod tangit planum, eidem parallelum: dico hunc mo
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tum reflecti ad angulos inæquales. </
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>Excitetur linea hypomo
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chlij
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en,
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&
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fg
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ad eam perpendicularis:
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eritq;
">eritque</
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grauitas tota
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qua-dratũ
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dratum</
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fh;
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grauitas autem mo vens quadratum
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fg.
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dividatur bi
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fariam linea
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hf
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in
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p;
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<
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eoq;
">eoque</
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centro circulus deſcribatur
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hif.
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Quòd ſi ergo ſumatur chorda
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fi
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æqualis
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fg;
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erit chorda re
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liqua
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hi;
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<
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huius quadratum dabit plagam. </
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<
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>Et quia plaga
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fit per lineas
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fa. fh. fe:
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erit per 5 theor: huius motus reflexus
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in lineâ
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fc,
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& motus centri in lineâ
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fm
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eidem plano parallelâ. </
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<
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>Si ergo fiat ut
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fi
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ad
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ih,
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ita
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fm
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ad
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fl;
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erit motus medius
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fk,
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&
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angulus reflexionis
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kfm;
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quem dico inæqualem angulo in
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cidentiæ
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hen.
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Quia enim angulus
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ahi
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externus eſt maior </
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