![]() The cross-sectional areas are congruent as shown by these yellow rectangles. Imagine the net folding up into a 3D shape. The faces are not the same they are different size rectangles. The 3D shape it will form is therefore a polyhedron.Ģ Identify if all the faces are the same regular shape. What 3D shape can be formed from this net?Īll the 2D shapes that make up this net are polygons they are all rectangles. Ii) For neither (non-polyhedron): those needed to be named on the GCSE syllabus are spheres and hemispheres.Įxample 1: naming a 3D shape from its net ![]() I) If yes, this is one of the Platonic solids (tetrahedron, cube, octahedron, dodecahedron or icosahedron).Ī) a pyramid or cone (3D shape with a base, an apex and similar cross-sectional areas).ī) a prism or cylinder (3D shape with congruent cross-sectional areas).Ī) For pyramids: the name of the base shape often forms the name of the 3D shape.ī) For prisms: the name of the cross-sectional area often forms the name of the 3D shape.Ĭ) i) For neither (polyhedron): This is an irregular polyhedron or a compound solid.
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