When you cut a 3D cube vertically, the shape you obtain is a rectangular prism, provided that the cut is made parallel to one of the cube’s faces. If the cut is made at an angle, the resulting shape could be a more complex polygon. However, slicing through the vertices or edges can create various cross-sections, but they will still maintain a rectangular or polygonal profile when viewed from the cut's face.
The shape you will get if you cut a cuboid in half is a cube.
cube
A cube is a 3D shape with a top and bottom.
triangle * * * * * A triangle is NOT a 3d shape! A cube.
They are cubes
The shape you will get if you cut a cuboid in half is a cube.
cube
cube
A cube is a 3D shape with a top and bottom.
a cube is a 3d square and a cylinder is 3d circle + rectangle shape.
triangle * * * * * A triangle is NOT a 3d shape! A cube.
A cube
cube
They are cubes
A cube
A cube
There is no special name since the resulting shape depends on the original shape. For example, a cuboid will remain a cuboid, a cube will become a cuboid.