# What Is a Square?

## What Is a Square?

A square is a four sided shape with four equal sides and four right angles. ### 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 angles in a square are right angles. • Opposite sides of a square are parallel. • All angles of a square add up to 360°. • 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. ### The Perimeter of a Square

The perimeter of a square is given by the formula: 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: In this formula, a is the length of the side of the square.

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)