Consider a rectangular book. The book is (approximately) symmetric (in the sense defined in the chapter) for rotations around an axis that is perpendicular to its face and goes through its center of mass

Question

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A rectangular book is symmetric for rotations around an axis that is perpendicular to its face and goes through its center of mass because rotating it 180 degrees around this axis will result in the book appearing the same due to its rectangular shape and uniform distribution of mass.

Consider a Rectangular Book