Marci of Kronland, Johannes Marcus, De proportione motus figurarum recti linearum et circuli quadratura ex motu, 1648

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              ratio EO maioris ad OD minorem, quàm FP minoris ad PD
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              maiorem. </s>
              <s>Et componendo ED ad OD, quàm FD ad PD. </s>
              <s>Eſt
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                <arrow.to.target n="fig9"/>
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              autem ut ED ad OD, ita motus verticalis ad motum inclina
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              tum in plano CAK. </s>
              <s>Et ut FD ad PD, ita idem motus vertica­
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              lis ad motum inclinatum in plano CAI, per theorem 10. </s>
              <s>Cùm
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                <expan abbr="itaq;">itaque</expan>
              motus inclinatus in plano CAI ſit magis ſimilis verticali,
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              erit velocior motu inclinato in plano CAK. </s>
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              THEOREMA XII.
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              Grauitas movens inæqualium & ſimilium figurarum in eodem pla­
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              no inclinato, eſt inæqualis & æqualiter mouet.
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                <emph.end type="center"/>
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              <s>Moueantur in plano AC duo triangula ABC maius, & A
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              DE minus: & ex angulis EC ducantur lineæ EP. CO paralle­
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              læ verticali AQ: lineæ verò FG. CF per illorum centra GF.
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              quæ per problema theorem: 1 erunt perpendiculares ad baſim
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              AB
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              exijſdem centris FG cadant lineæ FM. GN. perpen­
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              diculares ad AQ. Quoniam
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              triangula CFH. EGI, & tri­
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              angula CFK. EGL ſunt ſimilia: erit CF ad EG, ut FH ad GI </s>
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