1. What is a polygon? a closed figure made by joining line segments
Each line segment intersects exactly two others.
line segments do not intersect
*All images are either original artwork or are used with permission from Microsoft Word and Microsoft Online Design Gallery.

2. Are these figures polygons?
yes no
yes no

3. What is a regular polygon?
A regular polygon is a polygon whose sides are all the same length and whose angles are all the same.

4. These are not examples of regular polygons.
The sides are not all the same length.
The angles are not all the same.

5. Let’s look at some different kinds of polygons.
triangle
What is a three-sided polygon?

6. Polygons parallelogram
What is a four-sided figure whose opposite sides are parallel?

7. Polygons
rectangle
What is a four-sided polygon whose sides and angles are all the same?

8. Polygons
square
What is a parallelogram or rectangle with four equal sides and angles?

9. Polygons
rhombus
What is a parallelogram whose sides are all the same length?

10. Polygons
trapezoid
What is a four-sided polygon having exactly one pair of parallel lines?

11. Polygons
pentagon
What is a five-sided polygon?

12. Polygons
hexagon
What is a six-sided pentagon?

13. Polygons
heptagon
What is a seven-sided pentagon?

14. Polygons
octagon
What is an eight-sided pentagon?

15. Let’s review the polygons we‘ve learned about today.
regular polygon
triangle
parallelogram
rectangle
square
rhombus
trapezoid
pentagon
hexagon
heptagon
octagon

16. Can you identify these polygons?

17. Match these. Triangle eight sides Heptagon three sides
Octagon seven sides

18. Match some more. Pentagon four sides Hexagon five sides
Square six sides

19. Using your geoboards or dot paper, replicate these polygons.
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