Problem 2.1: What is the volume of a cube with edges of length one inch? [Solution]

Problem 2.2: Imagine a square, and another square in a plane perpendicular to the plane of the first square. If each square has side length one inch, what is the volume of the figure consisting of both squares? [Solution]

Problem 2.3: Into what kind of solid can all polyhedra be divided? [Solution]