2. Real Numbers
3. Polynomials
8. Triangles
11. Circles
12. Constructions
13. Heron's Formula
15. Statistics
16. Probability
Class 9 NCERT (CBSE and ICSE) Intercept Theorem (Thales Theorem, or Basic Proportionality Theorem) and Related Problems
Master this topic as part of Intercept Theorem and Midpoint Theorem