Angeli, Stefano degli, Miscellaneum hyperbolicum et parabolicum : in quo praecipue agitur de centris grauitatis hyperbolae, partium eiusdem, atque nonnullorum solidorum, de quibus nunquam geometria locuta est, parabola nouiter quadratur dupliciter, ducuntur infinitarum parabolarum tangentes, assignantur maxima inscriptibilia, minimaque circumscriptibilia infinitis parabolis, conoidibus ac semifusis parabolicis aliaque geometrica noua exponuntur scitu digna

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            D B; </s>
            <s xml:id="echoid-s1176" xml:space="preserve">ſicutietiam centrum grauitatis cuiuslibet eius
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            partis erit in medio partis B D, quæ erit altitudo
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            partis exceſſus.</s>
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          <head xml:id="echoid-head57" xml:space="preserve">PROPOSITIO XXI.</head>
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            <s xml:id="echoid-s1178" xml:space="preserve">In ſchemate prop. </s>
            <s xml:id="echoid-s1179" xml:space="preserve">19. </s>
            <s xml:id="echoid-s1180" xml:space="preserve">cylindrus ex parallelogrammo A F,
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            circa E F, eſt ad ſchdum ex figur a mixta C B E F, circa
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            cum tertia parte rect anguli K A B.</s>
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