### Theory:

Square is one of the most basic shapes. A square is a quadrilateral with four equal sides & four equal angles.

Basic properties of a square are:
• Equality
• Bisection
• Perpendicularity
Equality:
• Opposite sides of a square are parallel and equal in length.
• All four angles of a square are equal. (Each is $$360°/4$$ $$=$$ $$90°$$, so every angle of a square is a right angle.)
• The diagonals of a square are equal.
• All four sides of a square are equal.
Bisection:
• The diagonals of a square bisect each other.
• The diagonals of a square bisect its angles.
Perpendicularity:
• All the angles of the square are equal to $$90°$$.
• Diagonals meet at $$90°$$.