CFU Students, you already know that a shape’s sides have a length.

1. Learning Objective Name __________________________ Today, we will find the perimeter of a polygon. CFU What are we going to do today? Activate (or Provide) Prior Knowledge How many sides does each shape have? What are the lengths of the sides of each shape? 3 in 1. 6 in 2. 3 sides 4 in 3 in 4 sides 3 in 5 in 6 in 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.

2. Concept Development A polygon is a closed plane1 figure2 with straight sides. 1 flat 2 shape Units Polygons NOTPolygons centimeters (cm) feet (ft) inches (in) meters (m) 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 5 in 3 in The perimeter of the polygon is 12 in. 4 in 3 in 4 in 5 in 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 ______________.

3. Skill Development/Guided Practice 2 cm 2 cm 3 cm 5 cm 3 cm 5 cm A polygon is a closed plane figure with straight sides. Perimeter is the length of the distance around a polygon. Units Find the perimeter of a polygon. centimeters (cm) feet (ft) inches (in) meters (m) 1. 2. 3 + 5 + 4 = 12 in 4 + 4 + 2 = 10 ft 5 in 3 in 4 ft 4 ft The perimeter is 12 in because it is the distance around the polygon. The perimeter is 10 ft because it is the distance around the polygon. 4 in 2ft 3. 5 ft 4. = 20 m 5 + 5 + 5 + 5 = 20ft 2 + 8 + 2 + 8 8 m The perimeter is 20 m because it is the distance around the polygon. 5 ft 5 ft The perimeter is 20 ft because it is the distance around the polygon. 2 m 2 m 8 m 5 ft 2 m 3 + 3 + 2 + 2 + 5 + 5 =20 cm 5. 6. = 18 m 5 + 2 + 2 + 2 + 3 + 4 2 m 2 m 5 m The perimeter is 18 m because it is the distance around the polygon. The perimeter is 20 cm because it is the distance around the polygon. 3 m 4 m CFU (#1) How did I/you add the side lengths of the polygon? (#2) How did I/you interpret the perimeter?

4. Relevance 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?

5. A polygon is a closed plane figure with straight sides. Perimeter is the length of the distance around a polygon. Units Skill Closure centimeters (cm) feet (ft) inches (in) meters (m) Find the perimeter of a polygon. 4 cm 1. 2. 2 + 4 + 2 + 4 = 12 cm 2 + 2 + 1 = 5 cm 2 cm 2 cm 2 cm 2 cm The perimeter is 5 cm because it is the distance around the polygon. The perimeter is 12 cm because it is the distance around the polygon. 4 cm 1 cm Constructed Response Closure Which of the following lengths could represent the perimeter of the polygon to the left? Explain your answer. A B ____________________________________________________________________________________________ Summary Closure What did you learn today about finding the perimeter of a polygon? (pair-share)

6. Independent Practice Name ________________________ A polygon is a closed plane figure with straight sides. Perimeter is the length of the distance around a polygon. Units Find the perimeter of a polygon. centimeters (cm) feet (ft) inches (in) meters (m) 1. 2. 7 ft 3 + 7 + 3 + 7 = 20 ft 4 cm 4 + 4 + 4 + 4 = 16 cm 3 ft 3 ft 4 cm 4 cm The perimeter is 16 cm because it is the distance around the polygon. The perimeter is 20 ft because it is the distance around the polygon. 7 ft 4 cm 3. 4. 4 cm 5 + 4 + 3 = 12 cm = 8 ft 3 + 3 + 2 3 ft 3 ft 3 cm 5 cm The perimeter is 8 ft because it is the distance around the polygon. The perimeter is 12 cm because it is the distance around the polygon. 2 ft 3 + 3 + 3 + 3 + 3 = 15 in 6. 5. 3 in 3 in 2 ft 4 + 2 + 2 + 2 + 2 + 4 = 16 ft 2 ft 2 ft The perimeter is 15 in because it is the distance around the polygon. 3 in 3 in The perimeter is 16 ft because it is the distance around the polygon. 4 ft 2 ft 3 in 4 ft

7. Periodic Review 1 Name ________________________ A polygon is a closed plane figure with straight sides. Perimeter is the length of the distance around a polygon. Units Find the perimeter of a polygon. centimeters (cm) feet (ft) inches (in) meters (m) 2. 1. 6 cm 6 + 6 + 6 + 6 = 24 cm 3 + 4 + 3 4 in = 10 in 3 in 6 cm 6 cm The perimeter is 10 in because it is the distance around the polygon. The perimeter is 24 cm because it is the distance around the polygon. 3 in 6 cm 7 + 7 + 7 + 7 + 7 = 35 m 4. 3. 6 + 5 + 6 + 5 = 22 ft 7 m 7 m 5 ft The perimeter is 35 m because it is the distance around the polygon. 6 ft 7 m The perimeter is 22 ft because it is the distance around the polygon. 6 ft 7 m 7 m 5 ft 8 + 8 + 8 + 4 = 28 m 5. 6. 8 m 2 + 2 + 2 + 2 = 8 ft 2 ft 2 ft 8 m 8 m The perimeter is 8 ft because it is the distance around the polygon. The perimeter is 28 m because it is the distance around the polygon. 2 ft 2 ft 4 m

8. Periodic Review 2 Name ________________________ A polygon is a closed plane figure with straight sides. Perimeter is the length of the distance around a polygon. Units Find the perimeter of a polygon. centimeters (cm) feet (ft) inches (in) meters (m) 1. 2. 6 m 2 cm 2 + 2 + 2 + 2 = 8 cm 3 + 3 + 6 + 3 + 3 + 6 = 24 m 3 m 3 m 2 cm 2 cm 3 m 3 m The perimeter is 8 cm because it is the distance around the polygon. The perimeter is 24 m because it is the distance around the polygon. 6 m 2 cm 4. 3. 5 cm 7 ft 5 cm 7 ft 5 + 5 + 5 + 5 + 5 = 25 cm 7 + 7 + 7 + 7 = 28 ft 5 cm The perimeter is 28 ft because it is the distance around the polygon. 5 cm 7 ft The perimeter is 25 cm because it is the distance around the polygon. 7 ft 5 cm 8 ft 2 + 2 + 2 = 6 m 4 + 8 + 6 + 7 = 25 ft 5. 6. 2 m 2 m 6 ft 4 ft The perimeter is 6 m because it is the distance around the polygon. The perimeter is 25 ft because it is the distance around the polygon. 2 m 7 ft

9. Periodic Review 3 Name ________________________ A polygon is a closed plane figure with straight sides. Perimeter is the length of the distance around a polygon. Units Find the perimeter of a polygon. centimeters (cm) feet (ft) inches (in) meters (m) 1. 2. 3 in 5 cm 6 + 5 + 4 = 15 cm 3 + 3 + 3 + 3 = 12 in 3 in 3 in 4cm The perimeter is 12 in because it is the distance around the polygon. 6 cm 3 in The perimeter is 15 cm because it is the distance around the polygon. 4 + 3 + 3 + 4 + 3 = 17 cm 10 + 5 + 5 + 5 + 5 + 10 = 40 ft 3 cm 3 cm 3. 4. 5 ft 5 ft 5 ft 10 ft The perimeter is 17 cm because it is the distance around the polygon. 4 cm 4 cm The perimeter is 40 ft because it is the distance around the polygon. 5 ft 10 ft 3 cm = 20 ft 4 + 6 + 4 + 6 5. 6. 6 m 8 + 6 + 8 + 6 = 28 m 6 ft 8 m 4 ft 4 ft 8 m The perimeter is 20 ft because it is the distance around the polygon. The perimeter is 28 m because it is the distance around the polygon. 6 m 6 ft

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