The shape with the fewest corners, ie the sphere.
Chat with our AI personalities
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 :)