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Make 5 shapes using Tangrams.
Pentagon (and in 3d: triangular prism and tetrahedron.)
80 cm cubes
I would say a square-based pyramid but there are many 3 dimensional shapes with 5 sides.* * * * *The generic name is a pentahedron.
5 edges, 5 verts, and faces are only on 3d shapes, for the most part, so any 2d shape has 1