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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          <figure number="81">
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          <head xml:id="echoid-head118" xml:space="preserve">SCHOLIVM.</head>
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            <s xml:id="echoid-s3392" xml:space="preserve">Notetur obiter centrum grauitatis amborum.
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            <s xml:id="echoid-s3393" xml:space="preserve">triangulorum A B C, E D O, eſſe idem punctum. </s>
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            Sit enim H, centrum grauitatis trianguli A B C. </s>
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            Ergo qualium B D, eſt 6, & </s>
            <s xml:id="echoid-s3396" xml:space="preserve">D F, 3, B H, erit
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            4, D H, 2, & </s>
            <s xml:id="echoid-s3397" xml:space="preserve">H F, 1. </s>
            <s xml:id="echoid-s3398" xml:space="preserve">Ergo H, erit etiam centrum
              <lb/>
            grauitatis trianguli E D O.</s>
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          <head xml:id="echoid-head119" xml:space="preserve">PROPOSITIO LII.</head>
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            <s xml:id="echoid-s3400" xml:space="preserve">Maximus conus inſcriptibilis in quolibet cono, eſt cuius dia-
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            meter est tertia pars circumſcripti.</s>
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