Give a definition for square terms. Are there other terms that need to be defined first? What are they,and how might you define them?

(N/A) square is a quadrilateral in which all four angles are right angles and all four sides are equal.
To define a square,we need to define the following terms first:
$1$. Quadrilateral: $A$ simple closed figure made up of four line segments.
$2$. Line segment: $A$ part of a line with two end points.
$3$. Angle: The inclination between two rays having a common initial point.
$4$. Right angle: An angle whose measure is $90^{\circ}$.
In the figure,$PQRS$ is a square.