What Is a Square?

What Is a Square?

A square is a four sided shape with four equal sides and four right angles.

a square

Dictionary Definition

The Oxford English Dictionary defines a rectangle as "a plane rectilinear and rectangular figure with four equal sides."

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Properties of Squares

  • All sides of a square are of equal length.

    all sides of a square are of an equal length
  • All angles in a square are right angles.

    all angles in a square are right angles
  • Opposite sides of a square are parallel.

    opposite sides of a square are parallel
  • All angles of a square add up to 360°.

    angles in a square add up to 360 degrees
  • The diagonals of a square bisect each other at right angles. The diagonals cross each other half-way along their lengths and are perpendicular to each other.

    diagonals of a square bisect each other

The Perimeter of a Square

The perimeter of a square is given by the formula:

perimeter of a square equals four times the side length

In this formula, a is the length of the side of the square.

The Area of a Square

The area of a square is given by the formula:

area of a square equals side length squares

In this formula, a is the length of the side of the square.

Read more about how to find the area of a square

See Also

What is a right angle? What is an angle? Finding the area of a square What is a polygon? What is a square number? What is a square root? Learn about squares ( interactive widget)