This Problem Set is a part of the Lesson 12, Unit 3, Grade 8. Students use properties of similar triangles to solve real-world problems. This lesson is the first opportunity for students to see how the mathematics they have learned in this module relates to real-world problems. Each example, exercise, and item in the Problem Set is in a real-world context (e.g., the height of a tree, the distance across a lake, and the length needed for a skateboard ramp).