This math topic focuses on solving for unknown angles within triangles that contain an isosceles triangle inside. It's part of a unit on basic problem-solving with 2D polygons, targeting angle calculations in geometric shapes. The problems are presented in a multiple-choice format, providing students with a set of possible numerical options for each question about the value of angle X in various triangle problems. The problems are visually aided by diagrams to help in understanding the geometric setup and to assist in calculating the unknown angles.