This Problem Set is a part of the Lesson 7, Unit 2, Grade 8. Students learn about the sequence of transformations (one move on the plane followed by another) and that a sequence of translations enjoys the same properties as a single translation with respect to lengths of segments and degrees of angles. Students learn that a translation along a vector followed by another translation along a vector of the same length in the opposite direction can move all points of a plane back to their original positions.