#### The Square

The square is a rectangle with four equal sides.

AB=BC=CE=EA

The sum of the interior angles of a square is 360 degrees.

Every corner is a right angle 90 degrees.

The area of a square is A=S²

The perimeter is P=4S

Moreover, one of the most important properties of the square is that its formed by two 45-45-90 triangles, therefore you can find its diagonal by multiplying a side by √2.

Let's do an example