IM G Unit 1 Lesson 16
Clare says, "Last class I thought the parallelogram would have reflection symmetry. I tried using a diagonal as the line of symmetry but it didn’t work. So now I’m doubting that it has rotation symmetry."
Lin says, "I thought that too at first, but now I think that a parallelogram does have rotation symmetry. Here, look at this."
How could Lin describe to Clare the symmetry she sees?
IM G Unit 1 Lesson 16 from IM Geometry by Illustrative Mathematics, https://im.kendallhunt.com/HS/students/2/1/16/index.html. Licensed under the Creative Commons Attribution 4.0 license, https://creativecommons.org/licenses/by/4.0/.