3D = 3 dimensions ; arêtes = bords ; faces = surfaces.
1. Dans un solide en trois dimensions, qu’est-ce qu’une arête ?
2. Quelle affirmation distingue correctement un solide en trois dimensions d’une figure plane ?
3. Quelle description correspond à un parallélépipède rectangle ?
Solide 3D — définition ?
Objet de l’espace avec trois dimensions.
Arête — rôle ?
Segment délimitant deux faces.
Parallélépipède rectangle — caractéristiques ?
6 faces rectangulaires, pavé droit.
Cube — particularité ?
6 faces carrées, pavé droit.
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