1. Names & Properties of 2D Shapes
WALT: name & group 2D shapes & identify their properties

2. Regular vs Irregular Shapes
Regular shapes have sides that are all equal in length and inside angles that are all equal.
Irregular shapes have sides of any length and angles of any size.

3. POLYGON QUADRILATERAL
A polygon is a flat shape made up of straight lines and it is enclosed.
Some examples are:
3 sides - Triangle
4 sides - Quadrilateral
5 sides - Pentagon
6 sides - Hexagon
7 sides - Heptagon
8 sides - Octagon
9 sides - Nonagon
10 sides - Decagon
Quadrilaterals are 4 sided polygons.
Some examples are:
Square
Rectangle
Rhombus
Kite
Parallelogram
Trapezium

4. What is a shape with 3 straight sides?
A triangle!
Some triangles have a right angle. These are called right angle triangles.

5. Irregular quadrilateral
Any shape that has 4 straight sides is a quadrilateral.
rhombus
trapezoid
Irregular quadrilateral
parallelogram
kite
square
rectangle
How many quadrilaterals can you imagine?

6. Any shape that has 5 straight sides is a pentagon.
irregular pentagon
regular pentagon
Any shape that has 5 straight sides is a pentagon.
A regular pentagon has 5 sides of equal length.

7. What is a shape with 6 straight sides?
regular hexagon
Any shape that has 6 straight sides is a hexagon.
What do you think is special about a regular hexagon?

8. Any shape that has 8 straight sides is an octagon.
regular octagon
Any shape that has 8 straight sides is an octagon.

9. You may need to GOOGLE to find out!
What about 9 sided shapes?
10 sided shapes?
11 sided shapes?
12 sided shapes? Etc
What are they called?
You may need to GOOGLE to find out!