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Lambert sur la perspective

Deux constructions à la règle dûes à Lambert ayant trait à la perspective:

  • la construction en perspective de la parallèle à deux droites parallèles données et passant par un point extérieur,
  • la construction d'une ellipse point par point, vue comme un cercle en perspective, donnée par quatre points.

Construire un cercle à la règle!

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LambertPlan.ggb (6kb)

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Lambert V: concourantes hors du tableau par Lambert

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LambertV.ggb (7kb)

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Lambert V: concourantes hors du tableau

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LambertV.ggb (2kb)

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Théorème de Desargues

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Desargues.ggb (7kb)

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Lambert I: Ellipse comme cercle en perspective point par point

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Lambert.ggb (7kb)

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Lambert II: conique par cinq points, construite point par point en perspective

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Lambert2.ggb (7kb)

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