Definition
A square is a quadrilateral with all sides equal and all angles 90°.
Vertices
Four vertices A, B, C, and D.
Sides
All four sides are equal. Let the side length be s.
Angles
Each interior angle is 90°. Adjacent sides are perpendicular.
Perimeter
The perimeter is P = 4s.
Area
The area is A = s^2.
Diagonals
- Diagonals are equal and perpendicular.
- Diagonals bisect each other and the angles.