That's called a cube.
A cube is a three dimensional object with all faces squares. A cuboid is a three dimensional object with 4, or all 6, faces rectangles (and not square).
rectangular prism
A 3D square is surely a cube? Therefore, a cube has 6 faces.
2D is a shape or an object that is flat and u can not pick it up, and it has 2 faces. 3D is a shape or an object that is a shape and you cant pick it up and hold it, and it can have as many faces.
A Heptagon is a 3d object with 7 faces. An example of a heptagon is a hexagonal pyramid (that is a pyramid with a hexagon for the base).
a 3d object made of 2d faces with all flat sides
5 faces
[object Object]
A cube
Cube
You don't... you cant have 3 faces
Because its a 3d object