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

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              ALIA QVADRATVRA CIRCVLI
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              per motum.
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              <s>DVcatur à contactu G per centrum figuræ E linea GL æ­
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              qualis GB: & ex L ad eam perpendicularis LM ſecans B
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              C in M:
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              LM æqualis BM. </s>
              <s>Si enim iungatur recta BL,
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              duo anguli GBL. GLB, ac proinde reſidui MBL. MLB ſunt
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              æquales. </s>
              <s>Centro
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              M, interuallo ML deſcribatur arcus LB
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              ſecans
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              motûs reflexi GK in O: ex O verò demittantur per
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              pendiculares ON. OP. </s>
              <s>Quoniam
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              punctum G à plagâ re­
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              ciprocâ ex H per lineam agitur GL per 5 theorema: impulſus
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              verò reſiduus in FE per lineam GB per lemma 2. </s>
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                <expan abbr="Eſtq;">Eſtque</expan>
              motus
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              medius GK, erit per problem. propoſitionis 35 de propor. mo­
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              tûs, vt OP ad ON, ita impulſus in GB ad impulſum in GL, æ­
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              qualem impulſui in H. </s>
              <s>Et ſi quidem ON eſt ſemiſſis OP, erit
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              impulſus in OP ad impulſum in ON ut 4 ad 2. ſupponamus ve­
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              rò ſpatium decurſum ab E, ad ſpatium decurſum ab H eſſe in
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              ſeſquialterâ ratione, hoc eſt ut 3 ad 2. </s>
              <s>Igitur ſi circulus H acci­
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              piat impulſum ut 3, movebitur ad idem interuallum cum qua­
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              drato ABCD per corollarium 2 Axiomatis 1 & poſitionem 4. </s>
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              <s>Etſi fiat ut 4 ad 3 ita ABCD ad aliud; inventum erit quadra­
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              tum dato circulo H æquale. </s>
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              COROLL ARIVM
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              Eadem ratione inveniemus quadratum æquale ſectionibus
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              conicis,
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              adeo illarum fruſtis; ſi loco circuli hu­
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              iuſmodi figuras ſubſtituamus.
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