1. The problem states that ABCD is a square with right angles at each vertex. 2. In a square, all sides are equal in length. 3. Therefore, $AB = BC = CD = AD$. 4. The arrows indicate that $AB$ is equal to $CD$ and $BC$ is equal to $AD$. 5. Let's analyze each option: - A: $AD = BC$ is true because opposite sides in a square are equal. - B: $CD = AD$ is false because $CD$ and $AD$ are adjacent sides, not equal. - C: $AB = CD$ is true because opposite sides in a square are equal. - D: $AB = AD$ is false because $AB$ and $AD$ are adjacent sides, not equal. 6. Final answers: A and C are correct.