What characteristic must a parallelogram have to be classified as a square?

To classify a parallelogram specifically as a square, it must satisfy several key characteristics. A parallelogram is defined as a four-sided shape (quadrilateral) where opposite sides are parallel. However, to be a square, it not only needs to fulfill the requirements of being a parallelogram but also meet additional criteria.

The fundamental characteristics that confirm a parallelogram as a square are:

  • Equal Side Lengths: All four sides of a square must be of equal length. This means that in the context of a parallelogram, if the two pairs of opposite sides are equal in length, then the shape can potentially be a square.
  • Right Angles: Additionally, a square requires that all interior angles be right angles (90 degrees). Therefore, if a parallelogram has right angles at each corner, it can be identified as a square.
  • Congruent Diagonals: In a square, the diagonals not only bisect each other but are also equal in length. For a parallelogram to be a square, its diagonals must have this property.

In summary, a parallelogram must have equal side lengths, right angles, and equal diagonals to be classified as a square. If a shape meets these criteria, it can be comfortably identified as a square rather than just a general parallelogram.

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