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
*A
ll images are either original artwork or are used with permission from Microsoft Word and Microsoft Online Design
Gallery.      

                                                         
2
Are these figures polygons?        
yes
yes
no
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
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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
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ZHµYH OHDUQHG DERXW WRGD\. 
regular polygon 
triangle 
parallelogram 
rectangle 
square 
rhombus 
trapezoid 
pentagon 
hexagon 
heptagon 
octagon

                                                         
16
Can you identify these
polygons?            

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

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

                                                         

	

  Name:________                                                                Date:_______
 Lesson 19 Polygons Written Practice

   1.  One pack of trading cards sells for $1.12. For how much would seven packs sell?
   
   2. In the 1968 Olympics in Mexico City, Bob Beamon broke Ralph Bostons’ long jump world record by leaping    
   890 cm. The former record was 835 cm. How much greater was Beamon’s record than Boston’s record?

   3. Kerry had 17 bottles in her collection. Some friends gave her more. Now Kerry has 33 bottles. How many 
   bottles did her friends give her?
   
   4. Kim swam one kilometer in 40 minutes. The length of the pool was 25 meters. About how long did it take Kim 
   swam each length?

   5. Add this fraction   1/5 + 4/9 =

   6. Compute 150% of $70.

   7. Find the square root of 144, 64, and 81.

   8. All rectangles are also parallelograms. The formula for the area of a parallelogram is A =bh. Find A when b = 
   7 and h = 9.

   9. Write a fraction and a decimal equivalent to 40%.

  10. How many sides does a hexagon have?

19