Valerio, Luca, De centro gravitatis solidorvm libri tres
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              <s>
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              figura circumſcripta, quæ cum prædictis circa figuram AB
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              C erunt bina ſumpto ordine à puncto B, in eadem propor­
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              tione inter eadem plana parallela, vel rectas parallelas
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                ſtentia</expan>
              , propter ſectiones, ideſt baſes, & æquales altitudines:
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              binorum autem quorumque homologorum idem erit in li­
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              nea BF, centrum grauitatis: punctum igitur K, centrum
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              grauitatis figuræ ipſi ABC circumſcriptæ, idem erit fi­
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              guræ ipſi DBE, circumſcriptæ centrum grauitatis: cadi
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              infra centrum
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              grauitatis H figu­
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              ræ DBE, quod eſt
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              abſurdum.</s>
              <s>Non
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              igitur centrum gra­
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              uitatis figuræ DB
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              E, cadit ſupra pun
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              ctum G. </s>
              <s>Sed ca­
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              dat infra, vt in pun­
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              cto L. </s>
              <s>Rurſus igi
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              tur figuræ DBE fi­
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              gura, qualem dixi­
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              mus circumſcripta,
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              cuius centrum gra­
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              uitatis M, ſit pro­
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              pinquius centro L,
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              quàm punctum G, figuræ ABC altera qualem diximus
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              figura circumſcribatur, cuius centrum grauitatis ſit idem
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              punctum M, quod fieri poſſe conſtat ex ſuperioribus. </s>
              <s>Sed
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              G ponitur centrum grauitatis figuræ ABC; ergo centrum
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              grauitatis figuræ ipſi ABC, circumſcriptæ erit propinquius
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              baſi & puncto F, quàm figuræ ABC centrum grauitatis,
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              quod fieri non poteſt. </s>
              <s>Non igitur figuræ DBE centrum gra
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              uitatis cadit infra punctum G. </s>
              <s>Sed neque ſupra; punctum
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              igitur G erit commune duarum figurarum ABC, DBE,
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              centrum grauitatis. </s>
              <s>Quod demonſtrandum erat. </s>
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