## Perimeter

**OBJECTIVE**: To understand the difference between area and perimeter.

**PERIMETER**: The total length of the edge of a shape. For example, the perimeter of the rectangle below is 3 + 7 + 3 + 7 = 20.

**AREA:**The amount of space inside a flat (two-dimensional) object, such as a triangle or circle.

In math, the area of the rectangle below would be how many squares cover the shape. Can you find its area?

See if you can remember how to find the perimeter of a shape. Can you find the perimeter of the same (3 X 4) rectangle?

Without using any tricks/formulas, make a good

**CHALLENGE:**Without using any tricks/formulas, make a good

*estimate*(a number that is very close to the answer) of the area of each shape. Notice that each shape is made up of squares and*parts of squares*. Hint: Imagine putting together the*parts of squares*to make complete squares. If it helps, print out this page and cut out the shapes**ACTIVITY 1: Cheez-It Math**

Materials Needed:

· Cheez-it Crackers or other square-shaped cracker

· pencil

· eraser

· paper or notebook

You are only allowed to use 20 crackers. Rearrange 20 crackers into different shapes. You must use all 20 crackers to make each shape. The crackers must be touching each other - either side to side or corner to corner. For each shape, calculate its perimeter and area.

Task 1: Find the arrangement that has the largest perimeter. On your paper or notebook, make a sketch of the arrangement and show your work in finding the perimeter by labeling the length of each side.

Task 2: Find the arrangement that has the largest area. On your paper or notebook, make a sketch of it and show your work in finding the perimeter by labeling the length of each side.

Task 3: Discuss with a grown-up how you figured out the arrangement with the largest perimeter and how you figured out the arrangement with the largest area. What is the difference between the two shapes? Write your thoughts/observations down on your paper or notebook.

**ACTIVITY 2: Name Banner**

Materials Needed:

· Square centimeter graph paper (see below) OR

· Printable graph paper here:

http://www.classroomjr.com/printable-graph-paper-and-grid-paper/15-cm-grid-paper/

· pencil

· eraser

· markers or crayons

Using a pencil to sketch out your name on the graph paper. Each letter must be made out of the squares in the graph paper. See the example picture below. Find the area and perimeter of each letter and add those together to find the area and perimeter of your entire name. Decorate and color your name.

If you want to be really creative, instead of drawing your name, come up with your own picture/design. Bring your finished work to the next STEM Club meeting to share.

You can use a checkered sheet in your Science Notebook for this activity.