Unit 7, Lesson 17-- Perimeter

Lesson 17-- Perimeter

Introduction

Hello Mathematicians! Today we will be learning about finding the perimeter of shapes.

Video

Interactive

Part 1 Directions:

  • In the interactive below, find the perimeter of the shapes.

Part 2 Directions:

  • Today you will make some shapes using only squares by putting them together.
  • There are some conditions:
    • Only flat (2- dimensional) shapes are to be made.
    • Squares must join each other along the full length of an edge.
    • All the shape made must differ from one another.  Just turning or flipping the shape will not make it different.
    • Two shapes are not considered to be different if one can be fitted exactly on top of the other, turning it over or around if necessary. 
  • Draw each possible shape. Label each shape’s area and perimeter.
    • 1. Using 2 squares, how many different shapes are possible?
      2. Using 3 squares, how many different shapes are possible?
      3. Using 4 squares, how many different shapes are possible?
      4. Using 5 squares, how many different shapes are possible?

In Your Math Notebook

Let’s get out our math journals and  work through the following application problem. Make sure you read the problem carefully, draw a picture to match your thinking and write and solve an equation.

Read, Draw, Write, DONE!

R (Read the problem carefully.)

Iris needs to buy fencing for her garden.  Below is a figure of her garden.  How many units of fencing should she buy to go around the entire perimeter?

D (Draw a picture.)

W (Write and solve an equation.)

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Georgia Department of Education, Math