Commandino, Federico, Liber de centro gravitatis solidorum, 1565
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              ctiones circuli ex prima propoſitione ſphæricorum Theo
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              doſii: unus quidem circa triangulum abc deſcriptus: al­
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              ter uero circa def: & quoniam triangula abc, def æqua­
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              lia ſunt, & ſimilia; erunt ex prima, & ſecunda propoſitione
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              duodecimi libri elementorum, circuli quoque inter ſe ſe
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              æquales. </s>
              <s id="s.000835">poſtremo a centro g ad circulum abc perpendi
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              cularis ducatur gh; & alia perpendicularis ducatur ad cir
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              culum def, quæ ſit gk; & iungantur ah, dk perſpicuum
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              eſt ex corollario primæ ſphæricorum Theodoſii, punctum
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              h centrum eſſe circuli abc, & k centrum circuli def. </s>
              <s id="s.000836">Quo
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              niam igitur triangulorum gah, gdK latus ag eſt æquale la
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              teri gd; ſunt enim à centro ſphæræ ad ſuperficiem: atque
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              eſt ah æquale dk: & ex ſexta propoſitione libri primi ſphæ
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              ricorum Theodoſii gh ipſi gK: triangulum gah æquale
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              erit, & ſimile gdk triangulo: & angulus agh æqualis an­
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              gulo dg
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              K.
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              ſed anguli agh, hgd ſunt æquales duobus re­
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              ctis. </s>
              <s id="s.000837">ergo & ipſi hgd, dgk duobus rectis æquales erunt. </s>
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              & idcirco hg, g
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              K
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              una, atque eadem erit linea. </s>
              <s id="s.000839">cum autem
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              h ſit
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              circuli, & tri­
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              anguli abc grauitatis cen
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                <expan abbr="trũ">trum</expan>
              probabitur ex iis, quæ
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              in prima propoſitione hu
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              ius tradita ſunt. </s>
              <s id="s.000840">quare gh
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              erit pyramidis abcg axis. </s>
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              <s id="s.000841">& ob eandem cauſſam gk
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              axis pyramidis defg. </s>
              <s id="s.000842">lta­
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              que centrum grauitatls py
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              ramidis abcg ſit
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              l, & pyramidis defg ſit m. </s>
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              <s id="s.000843">Similiter ut ſupra demon­
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              ſtrabimus mg, gl inter ſe æquales eſſe, & punctum g graui
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              tatis centrum magnitudinis, quæ ex utriſque pyramidibus
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              conſtat. </s>
              <s id="s.000844">eodem modo demonſtrabitur, quarumcunque
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              duarum pyramidum, quæ opponuntur, grauitatis
                <expan abbr="centrũ">centrum</expan>
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