Theory:

Square is one of the most basic shapes. One of the quadrilaterals is a square of four equal sides & four equal angles.
sqare.png
 
Basic properties of a square:
  • Equality
  • Bisection
  • Perpendicularity
Equality:
  • Opposite sides of the square are parallel and equal.
  • All four angles are equal in measure. (Each angle is \(360°/4 = 90°\). So that each angle is a right angle).
  • The diagonals are equal in length.
  • All four sides are equal in length.
Bisection:
  • Diagonals bisect one another.
  • Diagonals bisect its interior angles.         
Perpendicularity: 
  • All interior angles are equal to \(90°\).
  • Diagonals meet at \(90°\).