2D - the triangle
3D - the tetrahedron (i.e. it has a triangle on each side and there are 4 sides.
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This is a misguided question since a pentagon is NOT a rigid shape.
A rigid shape is when you cant push/pull on it and make it turn into a different shape. You can make shapes rigid by adding "braces", which are lines that you put inside the shape to make triangles (which are rigid). For instance, a square is notrigid. To make it rigid, you would put a brace inside diagonally. This would create TWO triangles, and therefore, rigid. ~xDragonx
It is a 2D shape
a non rigid is a square and a hexagon
No.