Final answer:
Ricky's claim is incorrect since not all rotations that carry a square onto itself are multiples of 30 degrees.
Step-by-step explanation:
Ricky's claim is incorrect since not all rotations that carry a square onto itself are multiples of 30 degrees.
A rotation of 90 degrees or 180 degrees about the center of the square will also carry the square onto itself, but these rotations are not multiples of 30 degrees. Therefore, option a) Ricky's claim is incorrect since not all rotations that carry a square onto itself are multiples of 30 degrees, is the correct statement.