This Problem Set is a part of the Lesson 4, Unit 3, Grade 8. Students experimentally verify the properties related to the fundamental theorem of similarity (FTS). The goal of this activity is to show students the properties of the fundamental theorem of similarity (FTS) in terms of dilation. FTS states that given a dilation from center O and points P and Q (points P, Q, O are not collinear), the segments formed when P is connected to Q and P' is connected to Q' are parallel.