Square area with side 2 equal to 4
A square is a regular quadrilateral with all angles equal and all sides equal. Moreover, all the angles of the square are equal to 90°.
Square area formula 
where a is the side of the square.
where d is the diagonal of the square.
where P is the perimeter of the square.Solution:
S =
a2
=
22
=
4
Answer: the area of the square with the side 2 equal to 4