Square is a parallelogram where
all sides are equal and all angles are 90°
Properties of Square:
Since it is a parallelogram,
it will have all its properties
In parallelogram
- Opposite sides are equal
 - Opposite angles are equal
 - Diagonals bisect each other
 - Sum of adjacent angles is 180°
 
Other properties are
Diagonals are of equal length
i.e. AC = BD