Archimedes, Archimedis De iis qvae vehvntvr in aqva libri dvo

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        <div xml:id="echoid-div254" type="section" level="1" n="87">
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            <s xml:id="echoid-s4278" xml:space="preserve">
              <pb o="30" file="0171" n="171" rhead="DE CENTRO GRAVIT. SOLID."/>
            pra demonſtratum eſt, ita eſſe cylindrum, uel cylindri por-
              <lb/>
              <note position="right" xlink:label="note-0171-01" xlink:href="note-0171-01a" xml:space="preserve">8. huius</note>
            tionem ad priſina, cuius baſis rectilinea figura, & </s>
            <s xml:id="echoid-s4279" xml:space="preserve">æqua-
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            lis altitudo. </s>
            <s xml:id="echoid-s4280" xml:space="preserve">ergo per conuerſionem rationis, ut circulus,
              <lb/>
            uel ellipſis ad portiones, ita conus, uel coni portio ad por-
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            tiones ſolidas. </s>
            <s xml:id="echoid-s4281" xml:space="preserve">quare conus uel coni portio ad portiones
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            ſolidas maiorem habet proportionem, quam g e ad e f: </s>
            <s xml:id="echoid-s4282" xml:space="preserve">& </s>
            <s xml:id="echoid-s4283" xml:space="preserve">
              <lb/>
            diuidendo, pyramis ad portiones ſolidas maiorem pro-
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            portionem habet, quam g f ad f e. </s>
            <s xml:id="echoid-s4284" xml:space="preserve">ſiat igitur q f ad f e
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            ut pyramis ad dictas portiones. </s>
            <s xml:id="echoid-s4285" xml:space="preserve">Itaque quoniam à cono
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            uel coni portione, cuius grauitatis centrum eſt f, aufer-
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            tur pyramis, cuius centrum e; </s>
            <s xml:id="echoid-s4286" xml:space="preserve">reliquæ magnitudinis,
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            quæ ex ſolidis portionibus conſtat, centrum grauitatis
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            erit in linea e f protracta, & </s>
            <s xml:id="echoid-s4287" xml:space="preserve">in puncto q. </s>
            <s xml:id="echoid-s4288" xml:space="preserve">quod fieri
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            non poteft: </s>
            <s xml:id="echoid-s4289" xml:space="preserve">eſt enim centrum grauitatis intra. </s>
            <s xml:id="echoid-s4290" xml:space="preserve">Conſtat
              <lb/>
            igitur coni, uel coni portionis grauitatis centrum eſſe pun
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            ctum e. </s>
            <s xml:id="echoid-s4291" xml:space="preserve">quæ omnia demonſtrare oportebat.</s>
            <s xml:id="echoid-s4292" xml:space="preserve"/>
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        <div xml:id="echoid-div258" type="section" level="1" n="88">
          <head xml:id="echoid-head95" xml:space="preserve">THEOREMA XIX. PROPOSITIO XXIII.</head>
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            <s xml:id="echoid-s4293" xml:space="preserve">
              <emph style="sc">Qvodlibet</emph>
            fruſtum à pyramide, quæ
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            triangularem baſim habeat, abſciſſum, diuiditur
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            in tres pyramides proportionales, in ea proportio
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            ne, quæ eſt lateris maioris baſis ad latus minoris
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            ipſi reſpondens.</s>
            <s xml:id="echoid-s4294" xml:space="preserve"/>
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            <s xml:id="echoid-s4295" xml:space="preserve">Hoc demonſtrauit Leonardus Piſanus in libro, qui de-
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            praxi geometriæ inſcribitur. </s>
            <s xml:id="echoid-s4296" xml:space="preserve">Sed quoniam is adhucim-
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            preſſus non eſt, nos ipſius demonſtrationem breuíter
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            perſtringemus, rem ipſam ſecuti, non uerba. </s>
            <s xml:id="echoid-s4297" xml:space="preserve">Sit fru-
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            ſtum pyramidis a b c d e f, cuíus maior baſis triangulum
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            a b c, minor d e f: </s>
            <s xml:id="echoid-s4298" xml:space="preserve">& </s>
            <s xml:id="echoid-s4299" xml:space="preserve">iunctis a e, e c, c d, per line-
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            as a e, e c ducatur planum ſecans fruſtum: </s>
            <s xml:id="echoid-s4300" xml:space="preserve">itemque per
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            lineas e c, c d; </s>
            <s xml:id="echoid-s4301" xml:space="preserve">& </s>
            <s xml:id="echoid-s4302" xml:space="preserve">per c d, d a alia plana ducantur, quæ,
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            diuident fruſtum in tres pyramides a b c e, a d c e, d e f c.</s>
            <s xml:id="echoid-s4303" xml:space="preserve"/>
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