2. Real Numbers
3. Polynomials
8. Triangles
11. Circles
12. Constructions
13. Heron's Formula
15. Statistics
15.3. Bar Graph
15.4. Histogram
15.5. Frequency Polygons
15.7. Mean, Median, and Mode
15.7.1. Mean
15.7.2. Median
15.7.2.1. Median of Numerical Data
15.7.2.2. Median of Discrete Series
15.7.3. Mode
16. Probability