A 3d shape can have infinite sides
The most rigid shape that you can make out of straight pieces is the triangle.
2D - the triangle 3D - the tetrahedron (i.e. it has a triangle on each side and there are 4 sides.
This is a misguided question since a pentagon is NOT a rigid shape.
a pyramid is a 3D shape :)
The question is not clear. Hardest, as in the most rigid, is a triangular prism (or tetrahedron). Hardest, to work the geometry of, is probably an irregular blob.
A 3d shape can have infinite sides
The most rigid shape that you can make out of straight pieces is the triangle.
2D - the triangle 3D - the tetrahedron (i.e. it has a triangle on each side and there are 4 sides.
It's The Triangle
No
yes a pentagon is a rigid shape * * * * * I am afraid that it is not.
It depends on the 3d shape.
It is not a 3D shape.
A camera is a 3D shape. A photograph is a 2D projection of a 3D shape onto a 2D shape.
This is a misguided question since a pentagon is NOT a rigid shape.
a pyramid is a 3D shape :)