is a square a 3d shape
There can be no closed 3D shape with only one square and 3 triangles.
It's a 2D shape.
A 3d shape with 5 faces can be a square pyramid
A square pyramidthe answer is a square pyramid
take, for an example, a duck. This is a 3d shape because it has three dimensions. Compare this to a square, which is 2d. the difference is that the duck has a beak, and the square does not.
The simplest such shape is PYRAMID.
It is the 3D shape cylinder
It is a 3 dimensional shape