Not sure about plantonic, but the Platonic solid is a cube.
six faces
A solid with six congruent square faces is a cube.
A cube has six square faces.
A cube
A hexahedron is a solid with six plane faces, and a cuboid is a six-sided figure each face of which is a rectangle.
It is called a hexagon because it has six faces and also six vertexes.
A cube has six faces (sides).
its a hexagon that has 6 faces
Hexahedron
A rectangular prism.
cubes and cuboids
Rectangular parallelepiped