3D Shapes . Intro. We live in a three-dimensional world.
Every object you can see or touch has three dimensions that can be measured: length, width, and height. The room you are sitting in can be described by these three dimensions. The monitor you're looking at has these three dimensions. Plane developments of geometric bodies (1): Nets of prisms. A right prism is a polyhedron that has two congruents pararel polygonal faces (bases of the prism) and with all remaining faces are rectangles.
The main interest of this page is to see how a right prism can be developed into a plane net. There is a platonic solid that is a prism, the cube. Mathématiques magiques.