Square (geometry)

A Square

A square is a a special quadrilateral in that it is regular. A square has four equal sides and four equal angles, each angle measuring 90 degrees.

The area of a square can be found by squaring the square's side length - $A = s^2$ .

The perimeter of square can be found by multiplying the square's side length by four - $P = 4s$ .

The Diagonal of a square is obtained by the Pythagorean theorem. $D=\sqrt{s^2+s^2}=s\sqrt{2}$