The tetrahedral is defined with four equalateral triangles. Each leg of these triangles are two inches.
Octahedral
The octahedral is defined with eight equalateral triangle. Each leg of these triangles are two inches.
Cube
The cube is defined with six squares. Each leg of these squares are two inches.
Cubehedral
The cubehedral is defined with six squares and eight trangles. Each leg of these squares are two inches. Each leg of these triangles are two inches. The cubehedral is essentially a cube with each corner cut off.