Huygens, Christiaan
,
Christiani Hugenii opera varia; Bd. 2: Opera geometrica. Opera astronomica. Varia de optica
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ΕΞΕΤΑΣΙΣ CYCLOM.
"/>
habent quam baſes quibus inſiſtunt, certum eſſe quod dixi-
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mus, ſegmentum circuli C H G ad G H E F, eſſe ut ſoli-
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dum ex ductu plani A Y Q in pl. </
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<
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xml:space
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ductu plani Q Y V N in pl. </
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<
s
xml:id
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echoid-s537
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xml:space
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">Q X T N.</
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<
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</
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<
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<
s
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xml:space
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">Hæc ita enucleatè ſcribere volui, ne cui ignaro fortaſſe na-
<
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turæ demonſtrationum quibus Cl. </
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<
s
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xml:space
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">V. </
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<
s
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xml:space
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">utitur, ſcrupulus re-
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ſtare poſſet, quod ubi ille in d. </
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<
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">prop. </
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<
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xml:space
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">52, lib. </
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<
s
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="
echoid-s544
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xml:space
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">10, duo cir-
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culi ſegmenta conſiderat, quale ferè eſt G H E F, ego pro
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altero eorum ſumpſerim ſegmentum C H G: </
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>
<
s
xml:id
="
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xml:space
="
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">Quodque in
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linea A B ab ipſo termino A æquales partes capiam A Q,
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Q N. </
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<
s
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">Ipſum autem Cl. </
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<
s
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xml:space
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">Virum hæc remorari non poſſunt,
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neque hîc, neque in ſequentibus; </
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<
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xml:space
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">quia cum in d. </
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xml:space
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<
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</
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">& </
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">præcipit in linea a b æquales inter ſe ſumi
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h i, k l, ſcit hoc nullam limitationem admittere; </
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in ſchemate communi prop. </
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">10, ubivis in linea a b
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ſumitur i k, quæ dividitur in duas æquales i m, m k. </
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contingit in prop. </
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<
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">Revertor autem ad propoſitum, & </
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xml:space
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">conſtat nunc quidem,
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ſi detur Ratio ſolidi quod fit ex ductu plani A Y Q in pl.
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</
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<
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xml:space
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Q X T N, eo ipſo dari quoque rationem ſegmenti C H G
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ad ſegmentum G H E F, ac proinde continuò tunc inveni-
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ri poſſe quam rationem circulus habeat ad inſcriptum hexa-
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gonum regulare.</
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<
s
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xml:space
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">Vocemus autem brevitatis gratia, id quod fieri diximus
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ex ductu plani A Y Q in planum A H X Q, ſolidum H Y.
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</
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<
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xml:space
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">Item quod ſit ex ductu plani Q Y V N in planum Q X T N,
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ſolidum X V. </
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<
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xml:space
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">Similiter quod oritur ex ductu plani C Θ R
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in planum C K Δ R, vocemus ſolidum K Θ; </
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<
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">eâdemque
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brevitate dicamus ſolida Δ Γ, Μ Ξ, Λ Σ, quibus quæ de-
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notentur jam ſatis intelligitur.</
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<
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">His ſic conſtitutis, ſciendum eſt, omnem ſpem & </
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<
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tum perficiendæ Quadraturæ Cl. </
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<
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">Viro in eo poſitum eſſe,
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quod exiſtimet rationem ſolidi H Y ad ſolidum X V (quam
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unicam tantum deſiderari jam admonui) facile inveniri poſ-
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ſe, ſi cognitæ ſint duæ rationes hæ, nimirum ratio </
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