Clavius, Christoph
,
Geometria practica
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LIBER SEXTVS.
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literque poſita: </
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<
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xml:space
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"> Vt autem C G, ad C H, ita quoque eſt idem triangulum C B
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note-287-01
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xml:space
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">1. ſexti.</
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ad triangulum C B H; </
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<
s
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xml:space
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"> æqualia erunt triangula C I K, C B H: </
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287-01
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xlink:href
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http://echo.mpiwg-berlin.mpg.de/zogilib?fn=/permanent/library/xxxxxxxx/figures/287-01
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quum trapezium I K B A, reliquo triangulo H B A, æquale erit. </
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<
s
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xml:space
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"> Quocirca
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xml:space
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">7. quinti.</
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triangulum C I K, ad trapezium I K B A, vt triangulum C B H, ad triangulum H B A,
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hoc eſt, vt C H, ad H A, vel vt E, ad D. </
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<
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">quod faciendum erat.</
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<
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</
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<
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xml:space
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<
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<
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idem quoque aliter, ſi cadente puncto diuiſionis L, inter A, & </
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<
s
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">G,
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conſtruatur trapezium G N, per parallelam M N, æquale triangulo B G L; </
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<
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xml:space
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">2. hui{us}.</
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dente verò puncto diuiſionis H, inter G, & </
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<
s
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xml:space
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">C, trapezium conſtituatur B I, æqua-
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le triangulo B G H, per parallelam I K, &</
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<
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">c.</
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<
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<
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quadrilaterum A B C D, diuidendum ſit per lineam lateri
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C D, parallelam in duas partes, vt pars verſus A, ad reliquam habeat datam pro-
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portionem E, ad F. </
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<
s
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">Per ea, quæ in ſcholio propoſ. </
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">lib. </
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">Euclid. </
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<
s
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">vel potius per
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ea, quæ Num. </
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<
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<
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xml:space
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">cap. </
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<
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xml:space
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<
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xml:space
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">lib. </
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<
s
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">4. </
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<
s
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xml:space
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">huius tradidimus, quadrilatero A B C D, conſtrua-
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tur quadratum æquale G H I K; </
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<
s
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xml:space
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">ſecetur que latus G K, in L, in proportionem E,
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ad F, datam, & </
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<
s
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xml:space
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">per L, ipſi G H, parallela agatur L M. </
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<
s
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xml:space
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">Deinde ſuper C D, inter re-
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ctas C B, D A, fiat rectilineo L I, æquale quadrilaterum D O, habenslatus N
<
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xml:space
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lateri C D, parallelum: </
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">Et ſi quidem punctum O, cadit in latus C B, vel in ipſum
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punctum B, recta N O, problema efficiet. </
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<
s
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">Cum enim quadratum G I, toti qua-
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drilatero A C, æquale ſit, & </
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">rectangulum ablatum L I, quadril atero ablato D O;
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</
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<
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">erit quoque reliquum rectangulum G M, reliquo rectilineo A N O, æquale. </
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<
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<
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<
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xml:space
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">7. quinti.</
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>
Quapropter erit A N O, ad D O, vt G M, ad M K; </
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<
s
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xml:space
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"> hoc eſt, vt G L, ad L K,
<
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xml:space
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">1. ſexti.</
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vt E, ad F. </
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<
s
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">quod eſt propoſitum.</
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<
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<
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verò punctum O, cadit in C B, latus productum, (quod hic fiet, ſi propor-
<
unsure
/>
<
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tio data ſit Q, ad R. </
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<
s
xml:id
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xml:space
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">Diuiſo enim latere G K, in S, in datam proportionem Q. </
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R; </
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<
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<
s
xml:id
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xml:space
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">ſi ſuper C D, inter rectas D A, C B,
<
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xml:space
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ctangulo K T, æquale quadrilaterum D O, cadet O, vltra B & </
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<
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cabit latus A B, in P.) </
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<
s
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xml:space
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"> conſtituemus ſuper N P, inter rectas N A, P A, per
<
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lam V X, trapezium N V, triangulo B O P, æquale, factum erit, quod iubetur. </
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<
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dito enim communi rectilineo C D N P B; </
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<
s
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xml:space
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">erit totum rectilineum C D X V B, toti
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rectilineo D O, hoc eſt, rectangulo K T, æquale; </
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<
s
xml:id
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">ideoque & </
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<
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xml:id
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xml:space
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">reliquum triangu-
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lum A V X, reliquo rectangulo G T, æquale. </
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<
s
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xml:space
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"> Quare erit triangulum A V X,
<
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xlink:label
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xml:space
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">7. quinti.</
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>
rectilineum C D X V B, vt G T, ad K T, hoc eſt, vt G S, ad S K, vel vt Q, ad R.</
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<
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<
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symbol
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xlink:label
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xml:space
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">1. ſexti.</
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quod erat faciendum.</
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<
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<
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alia ratione problema abſoluemus, ſi antecedens proportionis </
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