2. Real Numbers
3. Polynomials
8. Triangles
11. Circles
12. Constructions
13. Heron's Formula
15. Statistics
16. Probability
17.1.1. Area of a Quadrilateral
17.1.2. Area of a Parallelogram
17.1.3. Area of a Rhombus
17.1.4. Area of a Trapezium