Marci of Kronland, Johannes Marcus, De proportione motus figurarum recti linearum et circuli quadratura ex motu, 1648

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              <s>
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              THEOREMA VIII.
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              Motus Trianguli Iſogoni ad baſim, non verò ad planum perpendi­
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              cularis, ſi in baſim moveatur, uno latere eidem plano par alle­
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              lo, ad angulos æquales reſtectit.
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                <emph.end type="center"/>
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            <p type="main">
              <s>In 2 figurâ moveatur triangulum
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              bcd
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              in baſim
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              cd,
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              ſectam
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              bifariam & æqualiter à motu centri in
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              a.
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                <expan abbr="ſitq;">ſitque</expan>
              latus
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              bd
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              paral­
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              lelum plano: Dico in hoc caſu triangulum
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              bcd
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              motu reflexo
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              angulum conſtituere æqualem illi, quem facit cum eodem pla­
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              no huius lapſus. </s>
              <s>Excitetur enim linea hypomochlij
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              cf,
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              du­
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              ctâ lineâ à centro perpendiculari
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              ai.
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              quia
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              ex demonſtra­
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              tis plaga eſt æqualis quadrato
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              ci,
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              & grauitas mouens centri
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              æqualis quadrato
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              ai:
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              eſt autem plaga, & qui hanc ſequitur mo­
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              tus reflexus in lineâ
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              ac
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              per 1 theor: motus verò centri in lineâ
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              tangente circuli centro
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              c
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                <expan abbr="atq;">atque</expan>
              interuallo
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              ac
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              deſcripti, paralle­
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              la nimirum plano
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              eg:
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              ſi fiat ut
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              ci
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              ad
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              ai,
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              ita
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              cl
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              ad
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              cm;
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              erit mo­
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              tus medius
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              cn
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              diameter parallclogrammi
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              clmn:
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              Dico angu­
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              lum
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              ncm
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              eſſe æqualem angulo
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              fce.
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              Quia enim recta
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              ac
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              per </s>
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