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1. Construction Problems
1. Construct a regular pentagon
2. Problems in the first workshop of GIHK
2. Dissection Problems
1. Dissecting Quadrilaterals
2. Cut Triangles into Rectangles & Dudeney’s Puzzle Generalized
3. Dissecting Rectangles into Squares
3. Games & Puzzles
1. Chinese Match Puzzles
2. 中國火柴遊戲
3. Upside Down?
4. A Square in Parallel Lines
5. Chocolate Bar Paradox
6. Diagonal Problem
Maths 24 合 24
4. Proofs without Words
Feynman's Triangle
Two Squares
5. Miscellaneous
Circle Pattern Animation
Dividing a Trapezium
Fishy Tessellation
Fractals by Iterations in Spreadsheet
Happy Halloween
Happy Halloween
Making strange shapes from a circle and quadrilateral
Moon and Sea
Napoleon Tiling
Radiation
Sine curve rotated