Ceva, Giovanni, Geometria motus, 1692

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              ctum iuxta tendentias rectas, obliquatur tamen ob ſubſe­
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              quentes, aliò tendentes niſus, & ob id diſtrahitur punctum
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              ipſum à priori tendentia, idem accidit ex alia parte ſi re­
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              flaxiſſet idem punctum, nempe hinc inde vnicam rectam
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              eandemque, continuantibus oppoſitis ad idem punctum
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              directionibus, ergo directio, & tangens vna, & eadem eſt
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              recta. </s>
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            <p type="margin">
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              Pr.
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              7.
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              huius.
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            <p type="main">
              <s id="s.000434">
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              Corollarium.
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              Hinc ſequitur, vnicam lineam dicendam eſſe, cum à quo­
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              cunque illius puncto vnica tantùm ex vtraque parte egre­
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              ditur tangens.
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            <p type="main">
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              DEF. III.
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              </s>
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              <s id="s.000437">QVòd ſi ex aliquo puncto duæ tangentes hinc inde
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              egredientes angulum efficiant; tunc propoſitam li­
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              neam inflexam dicemus, & punctum, in quo ſunt
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              contactus, inflexionis appellabitur. </s>
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            <p type="main">
              <s id="s.000438">
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              Corollarium I.
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              Ab hiſce deffinitionibus, & priori coroll. </s>
              <s id="s.000440">manat artificium
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              componendi duas curuas, vel curuam & rectam, adeout vni­
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              cam lineam efforment, nullumque angulum; nempe cum ſic
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              inuicem iungamus, vt tangentes ad punctum connexus, vnam
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              tantùm rectam efficiant.
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            <p type="main">
              <s id="s.000441">
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              Corollarium II.
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              Sed & illud patet, quibus angulis inflectantur lineæ inui­
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              cem compoſitæ, ſi ad punctum inflexionis angulum tangen­
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              tium obſeruauerimus, ſunt enim interſe æquales, licèt diuer­
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              ſa ſpeciei, cum vnus ſit curuilineus, & rectilineus alter.
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          </chap>
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