2. Algebra
3.1. Lines and Angles
3.2. Triangles
3.2.2. Right Triangles
3.2.4. Special Right Triangles
3.2.5. Perimeter and Area
3.2.6. Triangle Inequality
3.2.7. Similar Triangles
3.2.8. Congruence of Triangles
3.4. Circles
5. Trigonometry
6. Functions