Ceva, Giovanni, Geometria motus, 1692

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              <s id="s.000454">
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              rectæ lineæ, efficeretur ex ijs parallelogrammum ACBD, cu­
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              ius diameter AB; quamobrem ex datis punctis C, A, D repe­
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              riretur ſtatim punctum B, ſcilicet extremum ſemitæ compo­
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              ſiti motus, cuius latera ipſæ curuæ, aut rectæ AC, AD
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              —. </s>
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              PROP. X. PROB. III.
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              <s id="s.000456">EX datis
                <expan abbr="quotcunq;">quotcunque</expan>
              lateribus compoſiti motus, huius
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              ſemitæ terminum exhibere. </s>
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              Tab.
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              4.
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              Fig.
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              7.</s>
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              <s id="s.000458">Si latera compoſiti motus eſſent duo tantùm AB, AC.
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              <s id="s.000459">Facto parallelogrammo vt dictum eſt, inueniretur pun­
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              ctum E extremum motus: &
                <expan abbr="quæcunq;">quæcunque</expan>
              ſit ſemita, ſeu mo­
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              tus, poteſt idem E ſupponi tanquam extremum alterius la­
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              teris, adeoque, ſi motus conſtet ex tribus lateribus AC,
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              AB, AD, perinde ſit ac ſi foret duorum laterum AE, AD;
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              nam AC, AD valent ſimul ac ſolum AE; cum ita ſit, facto
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              etiam parallelogrammo EADF ex datis punctis E, A, D,
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              habebitur F extremum ſemitæ, cuius ſunt tria latera CA,
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              AD, AB — </s>
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              Corollarium.
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                <emph.end type="center"/>
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              Deducitur artificium deſcribendæ ſemitæ AE, vel AF, ſi
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              nempe aſſumptis partibus AG, AH, AI in dictis lateribus,
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              quæ quidem ſciantur percurri temporibus æqualibus, ſi per
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              ipſas ſingulas mobile punctum ferretur eo modo, quo in com­
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              poſito motu nititur per eaſdem directiones; reperietur in­
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              quam punctum K in ſemita AE, atque L in ſemita AF: qua­
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              re hoc modo ſumptis alijs, atque alijs partibus in ipſis lateri­
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              bus, reperientur alia, atque alia puncta ad ipſam ſemitam̨
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              pertinentia, quorum tandem beneficio, facile erit quaſitam
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              fermè ſemitam exarare.
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