Learning goals: Teacher Facing Comprehend that “a point on the circle” (in written and spoken language) refers to a point that lies on the edge of the circle and not in the circle’s interior. Create dilations of polygons using a circular grid given a scale factor and center of dilation. Explain (orally) how a dilation affects the size, side lengths and angles of polygons. Full lesson plan (warm-up, activities, synthesis, cool-down prompt) from 8.2 Dilations, Similarity, and Introducing Slope, Grade 8.