As shown in Figure 1 and Figure 2, the members of the Lesson Study group knew how to construct regular polygons, namely equilateral triangles, squares, regular pentagons, regular hexagons, regular heptagons, regular octagons, regular nonagons, and regular decagons by using the Selection Arrow Tool (to select and deselect objects), Compass Tool (to construct circles), Straightedge Tool (to construct segments) as well as the Display menu (to hide objects) and Transform menu (to rotate objects)