Perimeter and Area

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# Perimeter and Area - PowerPoint PPT Presentation

Perimeter and Area. Let the fun begin!. Why do I need to know this???. To find out the size of your foot To find out how long a bracelet would need to be to fit your wrist To find out how much carpet you would need for your house To measure the distance you walk your dog around your block.

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### Perimeter and Area

Let the fun begin!

Why do I need to know this???
• To find out the size of your foot
• To find out how long a bracelet would need to be to fit your wrist
• To find out how much carpet you would need for your house
• To measure the distance you walk your dog around your block

Betsy Bellinger and Stacey Spillman

### What is perimeter?

The distance around a geometric figure

### Formula for perimeter of a square

P=4s

OR

Just add all the sides together

### Let’s try it!

If one side of a square measures 8 inches, what is the perimeter of the square?

32 inches

Did you get it right?

### Formula for perimeter of a rectangle

P = 2L + 2W

OR

Just add all the sides together

### Let’s try it!

Find the perimeter of the rectangle above.

18 units

Don’t forget to label!

### What is area?

The number of square units needed to cover a surface

A= L x W

### Let’s try it!

Find the area of the rectangle above.

27 square cm

How did you do?

Did you remember to label?

### Let’s sum things up…

What did you learn today?

### Teacher websites

http://www.field-trips.org/trips.htm

Links to online field trips (has one for pi)

http://www.funbrain.com/

http://www.barrysclipart.com/

clipart available for teacher use

http://www.webdiner.com/

http://mathforum.org/pow/

Problems of the week

http://www.Scholastic.com/

Lesson plans and online activities

www.aaamath.com

Basic Math Skills and step by step tutorials

http://www.curiousmath.com/

offbeat lesson plans that could be used as attention grabbers to enhance lessons

www.mathgoodies.com

This has lesson plans and printables

www.teachervision.com

This site has lesson plans, printables, and helpful short articles.

www.inspiringteachers.com

This is a great site for resources and inspiration, especially for new teachers.

http://www.teachers.net/

This site has articles and lesson plans for all grade levels and content areas.

http://www.4teachers.org/

This is an all-in-one site that includes lesson plans, rubric-creators, printables, and gives the teacher access to set up a classroom calendar with daily assignments.

### Tangram Lesson plan

ENGAGE:

-Hold up a set of tangrams and ask the students if they can name each individual shape.

-Does anyone know what it is called when you put all of these shapes together in a set?

-Read the Grandfather Tang book aloud to the class, asking guided questions throughout.

-What did you learn from this story?

EXPLORE:

-Hand out manipulatives to explore on their own for 5-10 minutes.

-Show an example on the overhead of using the tangrams to create a shape from an

outlined puzzle, emphasizing that ALL shapes must be used and fit perfectly inside

the pattern.

-Hand out patterns/pictures for students to use to create their tangram picture.

-Walk around the room to encourage and monitor students.

-Tell students to trade patterns with a neighbor when they have completed their picture.

EXPLAIN:

-What does this activity have to do with math?

-What math skills did you use to create your picture?

-Have students take turns showing their finished picture to the class and share the strategy they used to solve the puzzle.

EXTEND:

-Take the class to the writing lab and have them use the interactive website http://matti.usu.edu/nlvm/nav/category_g_3_t_3.html to manipulate tangrams on

the internet to create prescribed shapes.

EVALUATE:

-Participation

-Students will write a one-paragraph reflection about what they learned in this

lesson, their reaction to the lesson, and an idea about how they can use skills

enforced in this lesson in real life.

### Tangram websites

TANGRAM WEBSITES

www.tangram.i-p.com/

(Interactive)

www.mathsyear2000.org/games/Tangram/

(Interactive)

www.enchantedlearning.com/crafts/chinesenewyear/tangram/

(Description of tangrams, guide on constructing own set, introduction to tangrams)

www.tangrams.ca/

(History, interactive, guide on constructing own set)

http://matti.usu.edu/nlvm/nav/category_g_3_t_3.html

(GREAT interactive, easy to use)

### Polygon Graphic Organizer

• PERIMETER
• Item Length Width Perimeter Unit of Measure Conversion
• door 7 4 22 ft. 7 yds 1 ft.
• textbook 12 7 38 in. 3 ft. 2 in.
• top of desk 22 16 76 in. 6 ft. 4 in.
• spiral notebook 12 6 36 in. 3 ft.
• calculator 6 4 20 in. 1 ft. 8 in.
• window 6 5 22 ft. 7 yds 1 ft.
• tile in floor 12 12 48 in. 4 ft.
• wall tile 12 5 34 in. 2 ft. 10 in.
• poster 5 3 16 ft. 5 yds. 1 ft.
• AREA
• Item Length Width Area Unit of Measure Conversion
• door 7 4 28 ft. 9 yds. 1 ft.
• textbook 12 7 84 in. 7 ft.
• top of desk 22 16 352 in. 29 ft. 4 in.
• spiral notebook 12 6 72 in. 6 ft.
• calculator 6 4 24 in. 2 ft.
• window 6 5 30 ft. 10 yds.
• tile in floor 12 12 144 in. 12 ft.
• wall tile 12 5 60 in. 5 ft.
• poster 5 3 15 ft. 5 yds.
• Reflection: From this project I learned the formulas for perimeter and area. I had a chance to practice measuring different objects.

Betsy Bellinger and Stacey Spillman