Quadrilateral shapes

Below we will discuss the six quadrilateral shapes:

Quadrilateral shape no. 1:

The  Irregular Quadrilateral

A quadrilateral in which all sides and angles are unequal is an irregular
quadrilateral.

Quadrilateral shape no. 2: 

The Trapezoid/Trapezium.

A quadrilateral in which one pair of sides is parallel.

Quadrilateral shape no. 3.

The Parallelogram

It is a quadrilateral in which

• opposite sides are parallel and equal.
• opposite angles are equal in measure
• diagonals bisect each other.
• The point of intersection of diagonals is mid point of diagonals.
• sum of two consecutive angles is 1800

Quadrilateral shape no. 4:

The Rhombus    

It is a parallelogram in which

• all sides are equal
•  diagonals bisect and are perpendicular to each other
• diagonals are not equal in length

Quadrilateral shape no. 5:

The Rectangle

A parallelogram in which

• opposite angles are equal and opposite
• diagonals bisect each other and are equal in length
• angles at the four vertices is 900

Quadrilateral shape no. 6:

The Square

• A parallelogram in which
• All sides and angles are equal
• Diagonals are equal and are perpendicular to each other.