1. 2D Shapes.
Polygons.

2. What is a polygon?
A polygon is a closed plane shape made out of straight lines.
The lines that make up the polygon are called sides.
The points at which the lines meet are called corners.

3. What is a polygon?
A polygon has the same number of sides as it has corners.
Polygons can be broken into two categories:
regular
irregular

4. What is a regular polygon?
A regular polygon is a polygon with all sides and corners equal.

5. What is an irregular polygon?
An irregular polygon is a polygon with different sides and angles.

6. Now let’s discuss different polygons…

7. The triangle has three sides and three angles.
It can be regular and irregular. It all depends upon the angles and sides.

8. The rectangle is an irregular polygon because the sides are not equal.

9. The square…
The square is a regular polygon because all its sides and angles are equal.

10. The pentagon…
The pentagon has five sides and five angles. It can be a regular or an irregular polygon.

11. The hexagon…
The hexagon is a six sided polygon. It has six angles. It can be regular and irregular.

12. The heptagon…
The heptagon is a polygon with seven sides and seven angles. It can be regular and irregular. It all depends on the sides and angles.

13. The octagon…
The octagon is an eight sided shape with eight angles. It can be regular and irregular.

14. Polygons around us… Closed
Polygons surround us
everywhere we go.
If we go shopping we may see a rectangular polygon saying that the shop is closed.
Closed

15. Polygons around us…
If we walk in the street we see many different polygons to be used by drivers or by passers by.

16. Polygons around us… Signs around us have different shapes.
Different shapes have different purposes.

17. A rectangular or square polygon… Closed
A square or a rectangular sign gives information.
Closed

18. A triangular sign displays a warning. Be careful!...
A triangular polygon…
A triangular sign displays a warning. Be careful!...

19. Other Polygons… Octagonal signs give orders.
Orders should be obeyed to avoid inconveniences to everybody.

20. Without signs our life would be without direction.

21. The End.