Instructional Activity# A Quadrilateral and Concentric Circles

Lesson 2. Unit 2. Grade 8 Open Up Resources

Open Up Resources10 min(s)

This Instructional Activity is a part of the Lesson 2, Unit 2, Grade 8. This activity continues work on dilations of polygons on a circular grid. The new twist in this activity is that the radial lines from the center of the circular grid have been removed. This means that when they dilate each point, students will need to use a ruler or other straightedge to connect that point to the center of the circular grid. If there is extra time, they can experiment dilating points other than the vertices and check that the dilation of a side of the polygon is still a line segment (though there may be small deviations due to measurement error).