In this lesson, students learned about rotational symmetry and the order of rotation of different shapes, specifically focusing on regular polygons. They explored how a shape maintains its appearance when rotated around its center, and discussed specific examples, like a shape with an order of rotation of three. The lesson also touched on creating diagrams to illustrate shading in relation to these geometric concepts. Overall, the students gained an understanding of how shapes can exhibit symmetry and how to identify their order of rotation.