Valerio, Luca, De centro gravitatis solidorvm libri tres
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              ipſius MF dimidia: ſed & rectæ BN, FO, triangulorum
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              baſes AC, ED, bifariam ſe­
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              cant; erunt igitur puncta L, M,
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              centra grauitatis triangulorum
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              ABC, DEF, oppoſitorum.
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              <s>Priſmatis igitur ABCDEF
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              axis erit LM: quare in eius bi­
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              partiti ſectione priſmatis ABC
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              DEF centrum grauitatis: ſectus
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              autem eſt axis LM bifariam in
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              puncto K; nam ob parallelogram
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              ma eſt vt NH ad HO, ita LK
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              ad KM; priſmatis igitur ABC
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              DEF, centrum grauitatis erit
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              K.
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              Quod demonſtrandum erat. </s>
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              PROPOSITIO XX.
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              <s>Omnis priſmatis baſim habentis trapezium, cu­
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              ius duo latera inter ſe ſint parallela centrum gra­
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              uitatis rectam lineam, quæ æque inter ſe diſtan­
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              tium parallelogrammorum centra iungit, ita di­
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              uidit, vt pars, quæ dictorum parallelogrammorum
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              minus attingit ſit ad reliquam, vt duorum baſis la
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              terum parallelorum dupla maioris vna cum mino
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              ri ad duplam minoris vna cum maiori. </s>
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              <s>Sit priſma ABCDEFGH, cuius baſis trapezium
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              ABCD, habens duo latera AD, BC, inter ſe paralle­
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              la, ſitque eorum AD maius: parallela igitur erunt inter ſe
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              duo parallelogramma BG, AH. </s>
              <s>Sit parallelogrammi AH
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              centrum K, & BG parallelogrammi centrum L, iuncta-</s>
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