Marci of Kronland, Johannes Marcus
,
De proportione motus figurarum recti linearum et circuli quadratura ex motu
,
1648
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Sit iam ſi fieri poteſt, hyperbole. aſſumatur verò huius diame
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ter partium 8, qualium AC eſt 10, & AV 2. </
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>Igitur triangu
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lum rectangulum contentum AV, & latere compoſito ex AV
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diametro figuræ erit partium 20:
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triangulũ
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verò
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contentũ
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AC
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latere compoſito ex AC & diametro eiuſdem figuræ,
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partium 180: huius verò ratio ad illud noncupla. eſt autem
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quadratum
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ſemiordinatæ CG ad quadratum alterius
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ſemiordinatæ VE in eadem ratione. propterea quòd latus CG
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ſit triplium lateris VE. </
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<
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eandem rationem ad ſe
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habeant rectangula ſubſegmentis axis hyperbolæ, quam habent
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quadrata ſemiordinatarum; erit permutando eadem
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ra
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tio rectangulorum ſub ſegmentis axis ad quadrata ſuarum ſe
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miordinatarum: ac proinde puncta EG in eadem hyperbole. </
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<
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>Rurſum verò quoniam AOS. AKF ſunt triangula ſimilia;
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& AO
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quadruplũm
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OS; erit
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KF quadruplum AK:
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& AK partium 5, qualium KF eſt 20. triangulum ergo
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rectangulum contentum AK
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latere compoſito ex AK
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& diametro figuræ erit partium 65: rectangulum verò conten
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tum AV, & latere compoſito ex AV
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diametro eiuſdem
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figuræ, partium 20. eſt autem ratio 65 ad 20 minor, quàm ſit
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quadrati KF ad quadratum VE: Igitur permutando non ea
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dem eſt ratio rectangulorum ſub ſegmentis axis ad quadrata
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ſemiordinatarum: ac proinde puncta EF non continentur in
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lineâ hyperbolæ. </
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<
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>Demum
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ellipſin eſſe hanc lineam motûs, ita oſtendo. </
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<
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>Producatur AC in Z: quam ſecetperpendicularis IZ. </
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<
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in I gravitas fiat æqualis impulſui; erit IZ maior omni
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bus rectis, quæ ex lineâ motûs cadunt perpendiculariter ad dia
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metrum AZ: ac proinde erit ſemidiameter figuræ. </
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<
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>At ve
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rò IZ æquatur ſemidiametro AZ: oportebat verò eſſe in
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æqualem: non igitur puncta AEFGHI in ellipſi continentur. </
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