Chapter 1 Polyhedra (3D Shapes)
Most of us are familiar with basic two dimensional shapes and their names. These include triangles, rectangles, pentagons, parallelograms, and maybe even a trapezoid. There are fewer three dimensional shapes with names, in part because so many combinations are possible. In this chapter we consider how to describe them in terms of their faces (sides). Whereas we call some 2D shapes polygons; we call similar 3D shapes polyhedra.
Each of you brings some knowledge of shapes. Find the first section with a problem for which you do not have an immediate answer, and begin your review there.
