Question 62
The figure above is cut along the lines into polygons (which need not be convex). No polygon contains a $2 \times 2$ square. What is the smallest possible number of polygons?
MathNet 1991 — Part 01 Question 62
Math Olympiad Vault · MathNet 1991 — Part 01
The figure above is cut along the lines into polygons (which need not be convex). No polygon contains a $2 \times 2$ square. What is the smallest possible number of polygons?