length width depth 3D shapes have different properties to 2D shapes. Faces - A face is a flat surface on a 3D shape. Edges - An edge is where two faces meet. For example a cube has 12 edges.

Reference: Kaczmarczyk JA, Roberts RR, Luke BT, et al. Comparative microsomal proteomics of a model lung cancer cell line NCI-H23 reveals distinct differences between molecular profiles of 3D and 2D ...

Kaczmarczyk, J. A., et al. (2021) Comparative microsomal proteomics of a model lung cancer cell line NCI-H23 reveals distinct differences between molecular profiles of 3D and 2D cultured cells.

This KS2 maths article explains how to sort 2D and 3D shapes according to their properties using Carroll diagrams and Venn diagrams, ... the length of the sides is the difference.

Oncotarget published "Comparative microsomal proteomics of a model lung cancer cell line NCI-H23 reveals distinct differences between molecular profiles of 3D and 2D cultured cells" which reported ...