What distinct characteristics does a square have?

A square is a special type of quadrilateral that possesses distinct characteristics, making it a unique figure in geometry. One of the primary aspects of a square is that it has all the properties of a parallelogram; this includes opposite sides that are both parallel and congruent. Additionally, in a square, not only are the diagonals congruent, but they are also perpendicular to each other. This means that they intersect at right angles, further distinguishing a square from other parallelograms.

The nature of the angles in a square is also significant. All four interior angles are right angles (90 degrees), which is contrary to the idea of having obtuse angles or only one pair of equal lengths, as stated in the other options. Each side of a square is equal in length, contradicting the notion of having only one side equal. Thus, the defining characteristics of a square align with its status as a special parallelogram with congruent and perpendicular diagonals, confirming that the correct response encompasses all these distinctions accurately.