Ceva, Giovanni, Geometria motus, 1692

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              PROP. IX. THEOR. VII.
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              <s id="s.000444">TAngens, ſeu directio motus in quocunque curuæ
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              puncto eſt illa recta, quæ vtrinque ſtatim cadens
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              extra curuæ conuexum ad eandem, quàm fieri poteſt ex
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              vtraque parte accedit. </s>
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              <s id="s.000445">Nam alia quæque recta tranſiens per punctum conta­
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              ctus ad ſectionem magis accedere nequit, quin ipſam illinc
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              ſecet, ob id extra conuexum eius non cadet, ab altera ve­
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              rò parte magis à propoſita curua ſeparabitur, quamobrem
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              nulla alia recta, quàm tangens poterit ſimul extra curuam
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              eſſe, & quàm fieri poteſt ad ipſam accedere. </s>
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              DEF. IV.
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              <s id="s.000447">LIneæ AC, AD occurrant ſibi in A, quod punctum in­
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              telligatur transferri ab A in C vnà cum linea AD
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              ſemper ſibi parallela, quo tempore punctum A currat ip­
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              ſam latam lineam ex A in D. </s>
              <s id="s.000448">Manifeſtum eſt idipſum
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              punctum A deſcripturum eſſe motu compoſito lineam
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              quandam AB diagonalem ſuperficiei parallelogrammæ
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              ABCD. </s>
              <s id="s.000449">Vocamus ergo diagonalem illam ſemitam com­
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              poſiti motus, & AC, AD latera illius. </s>
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              Tab.
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              4.
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              fig.
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              6.</s>
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              Corollarium I.
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              Manifeſtum eſt mobile dum currit AB tranſire etiam AC,
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              AD, licèt curuæ ſint, nam verè transfertur illo tempore, tam
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              ad lineam CB quam ad DB.
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              <s id="s.000453">
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              Corollarium II.
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              Præterea ſi ducerentur, autſint AC, CB, DA, DB, AB
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