A square is a polygon with 4 sides of equal length and 4 right angle corners (90 degree corners).

Because it has 4 sides of equal length, a square is a regular quadrilateral.

A square is also a rectangle with equal sides and a rhombus with right angles.

The area of a square is equal to the length of one side to the power of two (length squared).

The perimeter of a square is 4 times the length of one side.

A square has a larger area than all other quadrilaterals with the same perimeter.

The diagonals of a square bisect each other at 90 degrees and are perpendicular.

Opposite sides of a square are parallel.

The internal angles of a square add to 360 degrees.

A square has 4 lines of reflectional symmetry.

Square shapes are often used by humans for design and engineering purposes such as town planning.

A cube features six square faces and in many ways is like a square, only in three dimensions rather than two.