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

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              THEOREMA IX.
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              Impulſus quieſcens eſt æqualis reliquo ſegmento, quod abſcindit hy­
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              pomochlium à ſemidiametro figuræ motûs.
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              <s>Quia impulfus mouens & quieſcens ſimul ſumpti, toti impul­
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              ſui, hic autem ſemidiametro figuræ motus AC ponitur æqua­
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              lis per Axioma 2: Eſt veró impulſus movens æqualis uni ſe­
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              gmento AD per theorema 8. erit
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              impulſus quieſcens
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              æqualis alteri ſegmento DC. </s>
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              LEMMA.
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              Centrum grauitatis cuius〈que〉 figuræ rectilineæ invenire.
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              <s>Sit primùm in triangulo iſopleuro ABC inquirendum cen­
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              trum grauitatis. in quo ex duobus angulis B & C demittantur
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              lineæ ad baſim rectæ BD CE. </s>
              <s>Dico in communi illarum ſecti­
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              one F eſſe centrum grauitatis. </s>
              <s>Quia enim recta BD ſecat ba­
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              ſim mediam; eritineâ centrum grauitatis, per prop. 13 lib. 1
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              Archimedis de æquipond. </s>
              <s>Eſt verò idem in recta CE: igitur in
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              communi ſectione F. </s>
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