The four families of straight primary Geometric volumes are:
• Rectangular Volume / Cube
• Triangular Prism
• Pyramid
• Tetrahedron

All three Straight massive volumes have equal parameters for height and base while the tetrahedron is equal in height.

The other volumes show how these Primary volumes vary in general Proportions: extensional, superficial and massive.

Cross Section of Straight Geometric Volumes in X –Y – Z axis:

• Geometric Planes derived from the rectangular volume family are squares/rectangles. 
• Planes derived from the triangular prism family and Pyramid family are triangles and squares and rectangles.
• And planes derived from the tetrahedron family are regular or irregular triangles.