Valerio, Luca, De centro gravitatis solidorvm libri tres
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              quàm rectanguli BFE, ad rectangulum BDE. </s>
              <s>Sed vt
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              rectangulum BQE ad rectangulum BFE, ita eſt quadra­
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              tum SQ ad quadratum
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              F: & vt rectangulum BFE
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              ad rectangulum BDE, ita quadratum
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              F, ad quadra­
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              tum AD; minor igitur proportio erit quadrati SQ, ad
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              quadratum
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              F, quàm quadrati
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              F ad quadratum AD.
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              <s>Sed vt quadratum SQ ad quadratum
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              F, ita eſt qua­
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              dratum SZ ad quadratum
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              <37>: & vt quadratum
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              F ad
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              quadratum AD ita quadratum
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              ad quadratum
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              AC; minor igitur proportio erit quadrati SZ ad quadra­
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              tum
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              , quàm quadrati
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              , ad quadratum AC, hoc eſt
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              circuli SZ ad circulum
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              <37>, quàm circuli
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              <37>, ad cir­
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              culum AC; qui circuli ſunt ſectiones conoidis ABC
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              poſiti vt in propoſitionibus lemmaticis dicebamus. </s>
              <s>Rurſus
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              quoniam ſunt quatuor primæ proportionales; vt rectangu­
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              lum DBE ad rectangulum FBE, ita MD quadratum
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              ad quadratum
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              F: & totidem ſecundæ, vt quadratum
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              BD, ad quadratum BF, ita quadratum DK, ad quadra­
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              tum F
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              , ob ſimilium triangulorum latera proportionalia:
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              ſed vt EB, ad BD, hoc eſt rectangulum DBE prima in
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              primis ad quadratum BD primam in ſecundis, ita eſt
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              quadratum MD tertia in primis ad quadratum DK ter­
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              tiam in ſecundis; vt igitur compoſita ex primis ad com­
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              poſitam ex ſecundis, ità erit compoſita ex tertijs ad com­
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              poſitam ex quartis; videlicet vt rectangulum DBE
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              vnà cum quadrato BD, hoc eſt rectangulum BDE
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              ad rectangulum BFE, hoc eſt vt quadratum AD, ad
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              quadratum
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              F, ità compoſitum ex quadratis MD, DK,
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              ad compoſitum ex quadratis
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              F, F
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              : & quadrupla vtro­
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              rumque, vt quadratum AC, ad quadratum
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              <37>, ità com­
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              poſitum ex quadratis MN, KL, ad compoſitum ex qua­
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              dratis
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              ; hoc eſt eorum circulorum, qui ſunt ſectio­
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              nes ſolidorum, vt circulus AC, ad circulum
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              <37>, ità com­
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              poſitum ex circulis MN, KL, ad compoſitum ex circu­</s>
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