For the circle, any angle of rotation creates symmetry.) “Which shapes had the fewest angles of rotation that created symmetry? Which had the most?” (The isosceles trapezoid does not have rotation symmetry because the only rotations that take it to itself are 0 degrees or 360 degrees.Are there any angles of rotation that don’t create symmetry for all shapes of the given type?Īfter the gallery walk, ask students to share their observations about rotation symmetry.Are there any angles of rotation creating symmetry that the group missed?.Was there anything about the way the ideas are explained that made the ideas especially clear? Was there anything about the explanations that could be improved?.Was there anything about the organization of the visual display that made the ideas especially clear? Was there anything about the organization that could be improved?. Here is guidance for the kind of feedback students should aim to give each other: Invite students to do a “gallery walk” in which they leave written feedback on sticky notes for the other groups. If possible, display the reflection symmetry visual displays from the previous class for comparison. They will have to communicate with other groups to accomplish this. The purpose of this discussion is to identify what types of shapes have rotation symmetry.Īsk groups to display their visual displays in the classroom for all to see in order of the number of angles of rotation that create symmetry for their shape.
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