Bion, Nicolas
,
Traité de la construction et principaux usages des instruments de mathématique
,
1723
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141 - 150
151 - 160
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PRINCIPES
"/>
<
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>
<
s
xml:id
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xml:space
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">Ayant égard à leurs côtez; </
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>
<
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">celui qui a les trois côtez égaux ſe
<
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<
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xlink:label
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note-020-01
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xlink:href
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xml:space
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">Fig. 25.</
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nomme Triangle Equilateral, & </
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>
<
s
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">il eſt auſſi Equiangle.</
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<
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<
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<
s
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xml:space
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">Celui qui a ſeulement deux côtez égaux ſe nomme Triangle
<
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<
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xlink:label
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note-020-02
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xlink:href
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xml:space
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">Fig. 26.</
note
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Iſoſcele.</
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>
<
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<
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<
s
xml:id
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xml:space
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">Et celui qui a les trois côtez inégaux s'appelle Triangle Scalene.
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</
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<
s
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<
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position
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xlink:label
="
note-020-03
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xlink:href
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xml:space
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">Fig. 27.</
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</
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</
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<
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<
s
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">Ayant égard à leurs Angles; </
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>
<
s
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">le Triangle qui a un angle droit ſe
<
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<
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xlink:label
="
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xml:space
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">Fig. 28.</
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nomme Rectangle, & </
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<
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">le côté oppoſée à l'angle droit, ſe nomme
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Hypotenuſe.</
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<
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<
s
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xml:space
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">Celui qui a un angle obtus ſe nomme Obtuſangle, ou Ambli-
<
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<
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xlink:label
="
note-020-05
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xlink:href
="
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xml:space
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">Fig. 29.</
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gone.</
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<
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<
s
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xml:space
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">Celui qui a tous les angles aigus ſe nomme Acutangle, ou Oxy-
<
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<
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position
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xlink:label
="
note-020-06
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xlink:href
="
note-020-06a
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">Fig. 30.</
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gone.</
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<
s
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xml:space
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">Les Quadrilateres ou figures de quatre côtez, reçoivent auſſi
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differens noms.</
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<
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xml:space
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">Si les côtez oppoſez ſont paralleles, le Quadrilatere eſt appellé
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d'un nom general Parallelogramme.</
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</
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<
s
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xml:space
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">Si le Parallelogramme a les quatre côtez égaux, & </
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>
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">les quatre an-
<
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<
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xlink:label
="
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="
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">Fig. 31.</
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>
gles droits, on l'appelle Quarré.</
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</
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<
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<
s
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xml:space
="
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">Si tous les côtez ne ſont pas égaux, mais que les quatres angles
<
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/>
<
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position
="
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xlink:label
="
note-020-08
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xlink:href
="
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xml:space
="
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">Fig. 32.</
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ſoient droits, on l'appelle Quarré long, Parallelogramme Rectan-
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gle, ou ſimplement Rectangle.</
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</
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<
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<
s
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xml:space
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">La Ligne tirée dans un Parallelogramme d'un angle à l'autre qui
<
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lui eſt oppoſé, ſe nomme Diagonale, comme la ligne A B, même
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/>
figure.</
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<
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</
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<
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<
s
xml:id
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xml:space
="
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">Si les quatre côtez ſont égaux, & </
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<
s
xml:id
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xml:space
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">que les angles oppoſez ſoient
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<
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">II. Plan-
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che.</
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auſſi égaux, mais non droits, on l'appelle Rhombe ou Lozange.
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</
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<
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<
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xlink:label
="
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xlink:href
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">Fig. 1.</
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</
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</
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<
s
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xml:space
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">Si des quatre côtez les deux oppoſez ſont égaux, & </
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>
<
s
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">les angles
<
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<
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xlink:label
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="
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xml:space
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">Fig. 2.</
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oppoſez auſſi égaux, mais non droits, le Quadrilatere eſt appellé
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Rhomboïde.</
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<
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<
s
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">Ainſi le quarré eſt Equilateral & </
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">Equiangle. </
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<
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">Le quarré long eſt
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Equiangle & </
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<
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">non Equilateral. </
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<
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">Le Rhombe eſt Equilateral, & </
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<
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">non
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Equiangle: </
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<
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">& </
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<
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">le Romboïden'eſt ni Equilateral, ni Equiangle.</
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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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">Tout Quadrilatere, dont les côtez oppoſez ne ſont ni paralleles
<
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<
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position
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xlink:label
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xlink:href
="
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">Fig. 3.</
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ni égaux, ſe nomme Trapeze.</
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</
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<
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<
s
xml:id
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xml:space
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">Le Cercle eſt une figure plane, bornée par le contour d'une ligne
<
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/>
<
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position
="
left
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xlink:label
="
note-020-13
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xlink:href
="
note-020-13a
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xml:space
="
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">Fig. 4.</
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courbe, qu'on nomme Circonference, laquelle eſt également éloi-
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gnée du point du milieu, appellé Centre.</
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</
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<
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<
s
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="
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xml:space
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">Le Demi-cercle eſt une figure terminée par le Diametre & </
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>
<
s
xml:id
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xml:space
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">la de-
<
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/>
<
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xlink:label
="
note-020-14
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xlink:href
="
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xml:space
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">Fig. 5.</
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>
mie circonference.</
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<
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</
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<
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<
s
xml:id
="
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xml:space
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">Portion, ou Segment du Cercle, eſt une figure compriſe d'une
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<
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position
="
left
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xlink:label
="
note-020-15
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xlink:href
="
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">Fig. 4.</
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