This document contains the lesson plan and activities for a Mathematics IV class. It includes instructions for classroom activities where students will: 1. Learn about calculating the perimeter of triangles by finding the sum of all three side lengths. The formula for perimeter of a triangle is stated as P = a + b + c. 2. Participate in a game in small groups where they are assigned random side lengths and must calculate the perimeter of the triangle those lengths form. 3. Share what they have learned about finding the perimeter of triangles and the importance of understanding this process.