1. Area & Perimeter
Bridges Activities 1 & 2

2. What is area?
Tell someone at your table what you think it means and be prepared to share your thinking.
Area is a measure of how much surface something takes up
Area is measured in square units such as square inches, square feet, or square tiles.

3. Area using tiles
Each person at your table find a tile in the basket. What do you think the area of that tile is?
What could we do to find out for sure? You can measure using any of the tools on the table.
Now – you are going to work as a table to build a square with an area of exactly 144 square inches. Raise your hand when your group thinks you have it.

4. 144 Square inches
Discuss with your group how you found it and see if your group has the same squares as other groups.
What do you think?
Let’s see what the dimensions are for your square. Use a ruler to measure and write the dimensions with a dry erase marker.
What are the dimensions?

5. 144 sq. in.
12 in.
12 in.
144 sq. in.
Remember – when you write the measurements on the outside of a shape they are called the dimensions.

6. Work with your group to find the area of the blue piece of paper
Work with your group to find the area of the blue piece of paper. Discuss ways that you could prove this and how you can solve it in different ways.
Let’s share ~

7. How did you solve – using the chalkboard.

8. Formula
You guys have just shown us how to find the area using a formula.
What would the formula for finding a rectangle be?
A = l x w
Would it be different for finding the area of a square?
Let’s try a few problems for practice.

9. Caroline wants to cover one wall of her bedroom with paper
Caroline wants to cover one wall of her bedroom with paper. How could she find the amount of wallpaper she needs to cover her wall?
2 X (12 +7)
12 + 7
12 X 7

10. Mrs. Escamilla is covering her new bulletin board
Mrs. Escamilla is covering her new bulletin board. The board is shown below. How much paper will she need to cover it?
18 inches
53 in.
530 sq. in.
630 sq. in.
630 in.
35 inches

11. Perimeter & Area
Work with your table – compare and contrast perimeter and area.
What do they mean?
What is the same about them?
What is different?

12. Perimeter Activity
Find the perimeter of the blue piece of paper at your table.
How did you find it?

13. Perimeter
What do you think the perimeter of this red paper would be? Estimate and tell a partner.
Share & Discuss
Formula:
Can we come up with a formula for perimeter too?
P = 2w + 2L (2 X width + 2 X length)
For a square: P = 4s ( 4 X side)
Let’s add perimeter and area to our vocabulary lists.

14. The number of square units needed to cover a surface.
AREA
The number of square units needed to cover a surface.
Area = length x width
8 cm.
8 x 3 =
24 square cm.
3 cm.

15. Perimeter The distance around a figure. Formula = square = 4s
Rectangle = 2l + 2w
All other shapes – add ALL sides

16. Mr. Thomas is planting a rectangular garden and wants to put a fence around it. It is 12 ft. long and 7 ft. wide. How much fencing will he need?
84 ft.
38 ft.
19 ft.

17. Activity Sheet
Work with a partner to complete the activity sheet for area and perimeter.