- Circle Geometry
- Investigation 0-1
- Investigation 1-1
- Investigation 2-1
- Investigation 2-2
- Investigation 2-3
- Investigation 3-1
- Investigation 3-2a
- Investigation 3-2b
- Investigation 3-3
- Investigation 4-1
- Investigation 4-2a
- Investigation 4-2b
- Investigation 5-1a
- Investigation 5-1b
- Investigation 6-1
- Investigation 6-2
- Investigation 6-3
- Investigation 7-1
- Investigation 7-2
- Investigation 8-1
- Investigation 8-2
- Investigation: Ptolemy's theorem
- Investigation: Brahmagupta conjecture
