### Theory:

Quadrilateral:
A quadrilateral is a closed figure of exactly $$4$$ sides.
Before getting to constructing quadrilaterals, it is essential to know the properties of each of the quadrilaterals.
Properties of a parallelogram 1. A parallelogram has equal and parallel opposite sides.

2. The diagonals of a parallelogram always bisect each other.
Properties of a rhombus 1. All sides of a rhombus are equal.

2. The opposite sides of a rhombus are always equal and parallel.

3. All angles in a rhombus are always at $$90$$ degrees.

4. The diagonals always bisect each other and cut each other at right angles.
Properties of a rectangle 1. In a rectangle, the opposite sides are equal and parallel.

2. All angles in a rectangle are always equal and are always of $$90$$ degrees.

3. The opposite angles are always supplementary; that is, they sum up to $$180$$ degrees.
Properties of a square 1. All sides in a square are equal.

2. All angles in a square are equal and are of $$90$$ degrees.

3. The opposite sides in a square are always equal and are always parallel to each other.

4. The opposite angles are always supplementary; that is, they sum up to $$180$$ degrees.

5. The diagonals bisect each other and always cut each other at right angles.