1. Welcome
to the
Wonderful World of
Polygons

2. What We Hope You Learn by the End of this Presentation:
What is a polygon?
What are the different types of polygons?
What are congruent polygons?
What are similar polygons?
What are some examples of these polygons?

3. A polygon is a plane (flat) figure having three or more sides.
What Is a Polygon?
A polygon is a plane (flat) figure having three or more sides.
Types of Polygons:
Regular polygons are special. All the sides and angles are congruent. Congruent means the same in size, shape or measure.

4. Regular Polygons
A square is a regular polygon. All the sides and all the angles are congruent.

5. Regular Polygons
This is a regular pentagon. All five sides and all five angles are congruent.

6. Regular Polygons
This is a not a regular pentagon. It has five sides but they are not all congruent.

7. Let's Play a Polygon Matching Game:
Take a minute to match the name up with the figure . . .
pentagon
triangle
octagon
quadrilateral
hexagon
heptagon

8. What are Congruent Polygons?
Congruent polygons are polygons that have the same size and the same shape.
fact:
Congruent shapes have all their sides and angles congruent.
fact:

9. Let's See Some Congruent Polygons:
Notice how the second figures have the same shape and size of the first – they match exactly.

10. What are SimilarPolygons?
Similar polygons are polygons that have the same shape but not the same size.
fact:
Similar shapes have corresponding parts that are proportional (ex. all corresponding parts are 2 times as large, or ½ as large.)
fact:

11. Let's See Some Similar Polygons:
Notice how the second figures have the same shape but the sizes are different. All of the corresponding sides are the same proportion.

12. Non-Similar Polygons:
Notice how the second figures have the same shape but the sizes are different AND all of the corresponding sides ARE NOT the same proportion.

13. The End!