Points, lines, angles, curves, two- and three-dimensional shapes, volumes and proportions form the basics of home design as well as geometry. The living space of homes contains a wealth of three-dimensional geometry, including square and rectangular cubes, pyramids, cylinders and spheres as well as two-dimensional shapes, such as windows.

most common: The pentagon on the left is known as a regular pentagon, because all of its sides are the same length. The one on the right is also a commonly known pentagon, shaped like a house.