1. 2.6
“I can use strategies to develop formulas for determining perimeter and area of triangles, rectangles and parallelograms.”

2. Why do we need to know this?
Any Type of Construction
Work around the house.
Fence
Carpet
Wallpaper
Fertilizer
Is area and perimeter used in sports or band?
How many people would like to be able to buy the right size picture frame for a picture?

3. Vocabulary
Area - The amount of _______ covered by a figure measured in ______ units.
Square Units = sq. ft or _____
Two-dimensional - Only has a length and ______. Flat Surface. Ex. Carpet

4. Area of a Rectangle
Rectangle
L x W = Area
5 ft
3 ft

5. Area of a Parallelogram
Parallelogram - 4 sided figure with both pairs of opposite sides ______.
Height - goes from the base of a figure in a straight line to the _______ point.
Base x ________
6 cm
3 cm
4 cm

6. Area of a Triangle What does base mean?
How do you find the area of a parallelogram? _________
Area of a Triangle
Formula: __________
5 in
5 in.
4 in.
3 in.

7. Perimeter (ADD ALL THE SIDES)
Perimeter - the distance _______ a figure.
Linear Units - How ________ is labeled. Measuring just the length.
Example: A piece of rope.
One-Dimension - Only has ____ dimension (length).

8. Just Add All of THE OUTSIDE Sides TOGETHER!!!!
Perimeter
Just Add All of THE OUTSIDE Sides TOGETHER!!!!

9. FIND THE PERIMETER? (Equation)
3 ft
3 m
2 ft
4 ft
5 in.
7 in.
8 in.

10. Practice

11. Question?
What is the perimeter of this figure if each side is 8 inches?
A. 72
B. 64
C. 56
D. 16

12. Question?
A farmer keeps 20 chickens in a square pen that is 7 yards long on each side. How many yards of fence are needed around the pen?
A. 49 sq.yds
B. 28 yds
C yds
D. 28 sq. yds

13. Question?
Mr. Wilson’s garden is 15 meters long and 7 meters wide, what is the area of the garden?
A. 105 Sq. meters
B. 44 meters
C. 105 meters
D. 22 sq. meters

14. Question? What is the area of the parallelogram? A. 15 m2 B. 20m2
What is the area of the triangle?
A. 48cm2 B. 19cm2
5 m
3 m
5 cm
6 cm
8 cm

15. What did we learn today? Area of Rectangle Area of Parallelogram
Area of Triangle
Perimeter of a Rectangle
Perimeter of a Parallelogram
Perimeter of a Triangle
Height and Base