A fun way to use K'nex in the classroom is during a geometry lesson on shapes and angles! This activity helps students make, understand and see the different shapes and angles. 4.G.1: Draw points, lines, line segments, rays, angles, and perpendicular and parallel lines. Identify these in two-dimensional figures. 4.G.2: Classify two-dimensional figures based on the presence or absence of parallel or perpendicular lines, or the presence or absence of angles of a specified size.