Final answer:
A square is a specific type of rectangle, rhombus, and parallelogram, fulfilling the criteria of having equal angles and sides, and opposite sides parallel.
Step-by-step explanation:
A square is indeed an example of a rectangle, a rhombus, and a parallelogram. This is because by definition, a rectangle is a quadrilateral with all right angles, a rhombus is a quadrilateral with all sides of equal length, and a parallelogram is a quadrilateral with opposite sides parallel. A square fulfills all these criteria, hence it can be considered as all three of these shapes. Additionally, the properties of a square include that its diagonals are equal and bisect each other perpendicularly, which is a type of symmetry that rectangles and rhombi possess as well.