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.