Valerio, Luca, De centro gravitatis solidorum, 1604
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              diametri AG. </s>
              <s>Quod eſt propoſitum. </s>
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              COROLLARIVM.
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              <s>Hinc manifeſtum eſt, omnis parallelogrammi
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              centrum grauitatis eſſe in medio rectæ, quæ op­
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              poſitorum bipartitorum laterum ſectiones iungit. </s>
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              PROPOSITIO XV.
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              <s>Si quodlibet parallelogrammum in duo paral­
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              lelogramma diuidatur, & eorum
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              grauitatis
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              iungantur recta linea; totius diuiſi parallelogram­
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              mi centrum grauitatis prædictam lineam ita di­
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              uidit, vt eius ſegmenta è contrario reſpondeant
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              prædictis partibus parallelogrammis. </s>
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              <s>Sit parallelogrammum ABCD, ſectum in duo paral­
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              lelogramma AE, ED, &
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              parallelogrammi AE, ſit
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              centrum grauitatis H, pa­
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              rallelogrammi autem ED,
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              centrum grauitatis K: &
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              parallelogrammi ABCD,
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              ſit centrum grauitatis G:
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              & iungatur KH. </s>
              <s>Dico re­
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              ctam KH, diuidi à puncto
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              G, ita vt ſit KG, ad G
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              H, vt eſt parallelogrammum
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              AE, ad parallelogrammum
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              ED, Iungantur enim diametri AC, AE, ED. </s>
              <s>Igitur </s>
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