1. A Quadrilateral is a four sided shape which can be made from 2 triangles
The angles add up to 2 X 180 = 360º D B
A + B + C + D =360
The area =sum of the areas of the two triangles C
It fits inside a circle

2. The following quadrilaterals have properties which make them special
square
rectangle
rhombus
kite
Trapezium
without symmetry
Isosceles Trapezium
with symmetry
parallelogram

3. THE SQUARE
4 equal sides = 90
Opposite sides equal and parallel
Angles are = 90º
Diagonals are equal
Diagonals bisect each other at 90 º
4 lines of symmetry and quarter turn symmetry
Fits outline 8 ways

4. The rectangle = Opposite sides equal and parallel Angles are = 90º
Diagonals are equal
Diagonals bisect each other
2 lines of symmetry and half turn symmetry
Fits outline 4ways

5.  The rhombus Y 4 equal sides Opposite sides equal and parallelX Y
4 equal sides
Opposite sides equal and parallel
Opposite angles are equal
Diagonals bisect each other at 90 º
Diagonals bisect the angles
2 lines of symmetry and HALF turn symmetry
Fits outline 4 ways

6. The parallelogram =  Opposite sides equal and parallel XY
Opposite sides equal and parallel
Opposite angles are equal
Diagonals bisect each other
half turn symmetry
Fits outline 2 ways

7. The Kite = = 2 pairs of adjacent equal sides
One pair of opposite angles are equal X
One diagonal bisects the other one at 90 º
One diagonal bisecst the angles
1 line of symmetry
Fits outline 2 way

8. The isosceles trapezium
One pair of parallel sides
1 pairs of equal opposite sides X
two pairs of adjacent angles are equal
diagonals are equal Y
1 line of symmetry
Fits outline 2 way

9. The trapezium
One pair of parallel sides