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MathNet 2011 Question 34

Math Olympiad Vault · MathNet 2011

Question 34

A set of identical square tiles with side length $1$ is placed on a (very large) floor. Every tile after the first shares an entire edge with at least one tile that has already been placed.

- What is the largest possible perimeter for a figure made of $10$ tiles?
- What is the smallest possible perimeter for a figure made of $10$ tiles?
- What is the largest possible perimeter for a figure made of $2011$ tiles?
- What is the smallest possible perimeter for a figure made of $2011$ tiles?

Prove that your answers are correct.