# 2D shapes – square

A square is a geometric shape that has four straight sides of equal length, and four right angles (90-degree angles) at the corners. It is a type of rectangle with all sides of equal length, and it is also a type of parallelogram with all angles equal to 90 degrees. The area of a square is calculated by multiplying the length of one of its sides by itself (or squaring the length), and its perimeter is calculated by adding the length of all four sides.

One interesting fact about the square is that it has the maximum area for a given perimeter compared to any other shape. In other words, of all the shapes with the same perimeter, the square has the largest area. This property of the square is known as the isoperimetric inequality, and it has been proven mathematically.

Additionally, the square has a special place in many different cultures and traditions around the world. In ancient Chinese philosophy, the square represents earth, while the circle represents heaven. In Hinduism, the square is often used as a symbol of stability and grounding. In Islam, the Kaaba, the holiest site in Mecca, is a cube-shaped structure. In art and design, the square is often used as a simple and elegant shape to create balance and symmetry.

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