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1. REGULAR AND
IRREGULAR
POLYGONS

2. Polygons
 A regular polygon is a polygon whose sides
are all the same length and who angles are all
the same.

3.  The following are examples of regular
polygons:

4.  The following are examples of irregular
polygons:

5. Vertex
 The vertex of an angle is the point where the
two rays that form the angle intersect.

6. Vertices
 The vertices of a polygon are the points
where its side intersect.

7. If there is more than 1 vertex,
we call them vertices.

8. Check
 Look at the picture and decide if it is a regular
or irregular polygon.
 Raise your left hand if you see a regular
polygon.
 Raise your right hand if you see an irregular
polygon.

14. TYPES OF POLYGONS

15. TRIANGLE
 A three sided polygon. The sum of the angles
of a triangle is always 180 degrees.

16. QUADRILATERAL
 A four-sided polygon. The sum of the angles of
a quadrilateral is 360 degrees.

17. PENTAGON
 A five-sided polygon. The sum of the angles of
a pentagon is 540 degrees.

19. HEXAGON
 A six-sided polygon. The sum of the angles of
a hexagon is 720 degrees.

20. HEPTAGON
 A seven-sided polygon. The sum of the angles
of a heptagon equal 900 degrees.

21. OCTAGON
 An eight-sided polygon. The sum of the angles
of an octagon equals 1080 degrees.

22. NONAGON
 A nine-sided polygon. The sum of the angles
of an nonagon equals 1260 degrees.

23. DECAGON
 A ten-sided polygon. The sum of the angles of
an decagon equals 1260 degrees.

24. Let’s Listen to a song!
 While you listen to the song, I want you to
write the missing words!
 http://www.youtube.com/watch?v=TbR_rakilds