Name _____________________
L ea rn i n g Obj e cti v e
Today, we will find the perimeter of a polygon.
CFU
What are we going to do today?
Acti va t e ( o r p r o vi de ) P ri o r K n o wl edg e
How many sides does each shape have?
What are the lengths of the sides of each shape?
1.
2.
CFU
Students, you already know that a shape’s sides have a length.
Today, we will use the side lengths of a polygon to find the perimeter.
DataWORKS Educational Research
(800) 495-1550 • www.dataworks-ed.com
©2012 All rights reserved.
Comments? feedback@dataworks-ed.com
3rd Grade Measurement and Geometry 1.3 (3Q)
Find the perimeter of a polygon with integer sides.
Lesson to be used by EDI-trained teachers only.
Co n c e pt D ev el opm e n t
A polygon is a closed plane1 figure2 with straight sides.
1 flat
2
shape
Polygons
NOT Polygons
Perimeter is the length of the distance around a polygon.
 Side lengths can be measured in different units3.
3
amounts of measurement
Perimeter
3 in + 4 in + 5 in = 12 in
The perimeter of the polygon is 12 in.
CFU
On your whiteboard, draw an example of a polygon. Why is your example a polygon?
Which of the following lengths could be the perimeter of the polygon below? How do you know?
A
B
In your own words, what is perimeter? Perimeter is ____________.
DataWORKS Educational Research
(800) 495-1550 • www.dataworks-ed.com
©2012 All rights reserved.
Comments? feedback@dataworks-ed.com
3rd Grade Measurement and Geometry 1.3 (3Q)
Find the perimeter of a polygon with integer sides.
Lesson to be used by EDI-trained teachers only.
Ski l l Dev el o pm en t /G u i ded P ra cti c e
A polygon is a closed plane figure with straight sides.
Perimeter is the length of the distance around a polygon.
Find the perimeter of a polygon.
Step #1: Add all side lengths of the polygon.
a. Mark off side lengths as they are used.
Step #2: Interpret4 the perimeter using the correct units. “The perimeter is __ because ____.”
4 explain
1.
2.
4 ft
5 in
3 in
4 in
4 ft
2 ft
3.
4.
5 ft
5 ft
8m
2m
5 ft
8m
5 ft
5.
2m
2 cm
6.
2m
2 cm
3 cm
2m
2m
5 cm
5m
3m
4m
3 cm
5 cm
CFU
(#1) How did I/you add the side lengths of the polygon?
(#2) How did I/you interpret the perimeter?
DataWORKS Educational Research
(800) 495-1550 • www.dataworks-ed.com
©2012 All rights reserved.
Comments? feedback@dataworks-ed.com
3rd Grade Measurement and Geometry 1.3 (3Q)
Find the perimeter of a polygon with integer sides.
Lesson to be used by EDI-trained teachers only.
Rel e va n c e
A polygon is a closed plane figure with straight sides.
Perimeter is the length of the distance around a polygon.
1. Finding the perimeter of polygons will help you use measuring
in real life.
Sarah’s teacher tells her she will have to run a lap
around the soccer field for P.E. class. Sarah wonders
how many feet she will run around the soccer field.
2. Finding the perimeter of polygons will help you build things.
For Father’s Day, Jack is going to build his father a
new fence for the swimming pool. Before he can start
building, he needs to know the perimeter of the pool.
3. Finding the perimeter of polygons will help you do well on tests.
CFU
Does anyone else have another reason why it is relevant to find the perimeter of a polygon? (pair-share)
Why is it relevant to find the perimeter of a polygon? You may give me one of my reasons or one of your
own. Which reason is most relevant to you? Why?
DataWORKS Educational Research
(800) 495-1550 • www.dataworks-ed.com
©2012 All rights reserved.
Comments? feedback@dataworks-ed.com
3rd Grade Measurement and Geometry 1.3 (3Q)
Find the perimeter of a polygon with integer sides.
Lesson to be used by EDI-trained teachers only.
A polygon is a closed plane figure with straight sides.
Perimeter is the length of the distance around a polygon.
Ski l l Cl osu r e
Find the perimeter of a polygon.
Step #1: Add all side lengths of the polygon.
a. Mark off side lengths as they are used.
Step #2: Interpret the perimeter using the correct units. “The perimeter is __ because ____.”
1.
2 cm
2 cm
1 cm
4 cm
2.
2 cm
2 cm
4 cm
Co n st ru ct e d R e sp on s e Cl o su r e
Which of the following lengths could represent the
perimeter of the polygon to the left? Explain your answer.
A
B
_______________________________________________________________
_______________________________________________________________
Su mm ar y Cl o su r e
What did you learn today about finding the perimeter of a polygon? (pair-share)
DataWORKS Educational Research
(800) 495-1550 • www.dataworks-ed.com
©2012 All rights reserved.
Comments? feedback@dataworks-ed.com
3rd Grade Measurement and Geometry 1.3 (3Q)
Find the perimeter of a polygon with integer sides.
Lesson to be used by EDI-trained teachers only.
Name __________________________
A polygon is a closed plane figure with straight sides.
Perimeter is the length of the distance around a polygon.
In d ep en d en t P ra cti c e
Find the perimeter of a polygon.
Step #1: Add all side lengths of the polygon.
a. Mark off side lengths as they are used.
Step #2: Interpret the perimeter using the correct units. “The perimeter is __ because ____.”
1.
2.
7 ft
4 cm
4 cm
3 ft
4 cm
3 ft
4 cm
7 ft
3.
4.
4 cm
3 ft
3 ft
3 cm
5 cm
2 ft
5.
6.
2 ft
3 in
3 in
3 in
3 in
3 in
DataWORKS Educational Research
(800) 495-1550 • www.dataworks-ed.com
©2012 All rights reserved.
Comments? feedback@dataworks-ed.com
4 ft
2 ft
2 ft
2 ft
4 ft
3rd Grade Measurement and Geometry 1.3 (3Q)
Find the perimeter of a polygon with integer sides.
Lesson to be used by EDI-trained teachers only.
Name _______________________
A polygon is a closed plane figure with straight sides.
Perimeter is the length of the distance around a polygon.
P eri odi c R evi ew 1
Find the perimeter of a polygon.
Step #1: Add all side lengths of the polygon.
a. Mark off side lengths as they are used.
Step #2: Interpret the perimeter using the correct units. “The perimeter is __ because ____.”
1.
2.
6 cm
6 cm
6 cm
4 in
3 in
3 in
6 cm
3.
4.
5 ft
6 ft
7m
7m
6 ft
7m
7m
7m
5 ft
5.
6.
2 ft
2 ft
2 ft
2 ft
DataWORKS Educational Research
(800) 495-1550 • www.dataworks-ed.com
©2012 All rights reserved.
Comments? feedback@dataworks-ed.com
8m
8m
8m
4m
3rd Grade Measurement and Geometry 1.3 (3Q)
Find the perimeter of a polygon with integer sides.
Lesson to be used by EDI-trained teachers only.
Name __________________________
A polygon is a closed plane figure with straight sides.
Perimeter is the length of the distance around a polygon.
P eri odi c R evi ew 2
Find the perimeter of a polygon.
Step #1: Add all side lengths of the polygon.
a. Mark off side lengths as they are used.
Step #2: Interpret the perimeter using the correct units. “The perimeter is __ because ____.”
1.
2.
2 cm
6m
3m
2 cm
2 cm
3m
3m
6m
2 cm
3.
4.
7 ft
6
7 ft
3m
7 ft
5 cm
5 cm
5 cm
5 cm
5 cm
7 ft
5.
6.
8 ft
6 ft
4 ft
7 ft
DataWORKS Educational Research
(800) 495-1550 • www.dataworks-ed.com
©2012 All rights reserved.
Comments? feedback@dataworks-ed.com
2m
2m
2m
3rd Grade Measurement and Geometry 1.3 (3Q)
Find the perimeter of a polygon with integer sides.
Lesson to be used by EDI-trained teachers only.
Name __________________________
A polygon is a closed plane figure with straight sides.
Perimeter is the length of the distance around a polygon.
P eri odi c R evi ew 3
Find the perimeter of a polygon.
Step #1: Add all side lengths of the polygon.
a. Mark off side lengths as they are used.
Step #2: Interpret the perimeter using the correct units. “The perimeter is __ because ____.”
5 cm
1.
2.
3 in
4 cm
6 cm
3 in
3 in
3 in
3.
4.
5 ft
10 ft
5 ft
5 ft
3 cm
4 cm
5 ft
4 cm
3 cm
10 ft
5.
3 cm
6.
6 ft
6m
4 ft
4 ft
6 ft
DataWORKS Educational Research
(800) 495-1550 • www.dataworks-ed.com
©2012 All rights reserved.
Comments? feedback@dataworks-ed.com
8m
8m
6m
3rd Grade Measurement and Geometry 1.3 (3Q)
Find the perimeter of a polygon with integer sides.
Lesson to be used by EDI-trained teachers only.
Blank Page
DataWORKS Educational Research
(800) 495-1550 • www.dataworks-ed.com
©2012 All rights reserved.
Comments? feedback@dataworks-ed.com
3rd Grade Measurement and Geometry 1.3 (3Q)
Find the perimeter of a polygon with integer sides.
Lesson to be used by EDI-trained teachers only.