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A square has four sides of equal lengths. The angles between the sides are also equal (90°). The square is a special case of the rectangle.
The diagonal, perimeter and area can all be calculated if the side of the rectangle is known. This means that it is enough to know one of these four properties to be able to calculate the rest.
The word square is often used in mathematics to describe a number that is raised to the power of 2. For example, x² would then be called "x squared". Squaring a number can be thought of as calculating the area of a square where the sides are of that length.