## version 1.3

- added new sections in the chapter "Inversion" (18.1 sqrt(bc) Inversion and 18.2 sqrt(bc/2) Inversion)
- added a new chapter about Mixtilinear & Curvilinear Incircles (Chapter 17)
- added a new chapter about Spiral Similarity (Chapter 21)
- added 50 new unsolved problems (exact list at the end of the book)

## version 1.2

- added 50 new unsolved problems (exact list at the end of the book)
- added a new section in the chapter "A Few Useful Lemmas" (10.9 HM Point)
- added a new well-known lemma (Example 16.3 Midpoint of the altitude)
- added a new approach for proving Collinearity (8.2 Parallelogram Trick)
- added a new approach for proving Concurrence (9.4 Concurrent Perpendiculars)
- added a solved example with 4 different proofs in the chapter Symmedian (Example 15.1)
- added visual mnemonic for remembering the ratios in Menelaus' / Ceva's Theorem and the intersections in Pascal Theorem
- restructured the chapters a bit, now the book can roughly be divided in two parts:

Junior (first 10 chapters) and Senior (the other 12 chapters)

## version 1.1

- added 44 new unsolved problems (exact list at the end of the book)
- added a new well-known property in the chapter "A Few Useful Lemmas"
- added a few new solved examples in the chapter "Angles of a Transversal"
- fixed minor mistakes and typos