Properties of a quadrilateral

Parallelogram
- Opposite angles are congruent.
- Opposite sides are of equal length.
- Opposite sides are parallel.
- The diagonals bisect each other.

Kite
- Adjecent sides are equal.
- Opposite angles are congruent.
- The diagonals cross/bisect each other at 90 degrees.

Trapezium
- One pair of opposite sides are parallel.

SQUARE
- A square is a regular quadrilateral.
- All angles are equal to 90 degrees.
- All sides are of equal length.
- Opposite sides are parallel.
- The diagonals bisect each other at 90 degrees.
- The diagonals are of equal length.

Rectangle
- A rectangle is a quadrilateral.
- All angles are equal to 90 degrees.
- The opposite sides are equal and parallel.
- The diagonals are of equal length.

Rhombus
- A rhombus is a quadrilateral.
- Opposite angles are congruent.
- All sides are of equal length.
- Opposite sides are parallel.
- The diagonals bisect each other at 90 degrees.

WHAT IS A QUADRILATERAL?
A quadrilateral is a polygon which has 4 sides and angles and vertexes. A square and rectangle are the regular quadrilaterals.

HOW MANY QUADRILATERALS ARE THERE?
There are many but we have learnt about eight - Square, Rectangle, Kite, Trapezium, Trapezoid and Isosceles Trapezoid.