The purpose of this lesson is to give students further practice in performing dilations on a coordinate grid using the Information Gap activity structure. Using this structure, students identify missing information needed to perform a dilation that may take several rounds of discussion (MP1). One important use of coordinates in geometry is to facilitate precise and concise communication about the location of points (MP6). This allows students to indicate where the center of the dilation is and also to communicate the vertices of the polygon that is dilated.

The goal of today’s exercise is to use the suggestions from the previous exercise to revise the “Norms” sections of the Math Community Chart and to invite students to reflect on one norm that will be a strength for them. Both activities begin to build shared accountability for and investment in the classroom norms.