This document defines and describes several basic geometric shapes: a square is a rectangle with all sides the same length, a rhombus is a parallelogram with all four sides the same length. It also defines lines, line segments, rays, parallel lines, and midpoints - specifically that a ray extends from a point on a line in one direction, parallel lines never intersect, a midpoint is halfway between two endpoints, and a line segment is part of a line with two endpoints.