This Instructional Activity is a part of the Lesson 5, Unit 3, Grade 8. Now that we know FTS and the converse of FTS in terms of dilations, we practice using them to find the coordinates of points and dilated points on a plane. We begin simply. In the diagram, we have center O and ray OA. We want to find the coordinates of point A'. We are given that the scale factor of dilation is r=1/2.