1. Area of a Rectangle & Square#1
Area of a Rectangle & Square
The Area of a figure is the number of square units needed to cover it.
A = 2 3
6 square units
6 units2 2 3
Square
Rectangle 8m 4 8m 5

2. copyright©amberpasillas2010#2
USING CORRECT UNITS
PERIMETER: Is the distance around a figure.
in + in + in + in = in
AREA: Is the square units that cover a figure.
length • width = in • in = in2
VOLUME: The number of cubic units inside a figure.
length • width • height
in • in • in = in3
squared
width
length
height
cubed
width
length
copyright©amberpasillas2010

3. Area of a Parallelogram
# 3
To find the area for a parallelogram use what you know about area of a rectangle.
A = base x height
3 in
A = b x h
5 in
A = 5 x 3
= 15 in2

4. Area of a Triangle # 4 A = base x height A = 8 x 6
A triangle is half the area of a rectangle.
To find the area of a triangle you use the rectangle formula and divide it in half.
A = base x height 2
6 m
8 m
A = 8 x 6
= 24 m2 2

5. Area of a Trapezoid A = (b1 + b2) x h A = (4 + 5) x 3 2 A = (9) x 3 27
# 5
4 ft
A = (base1 + base2) x height
3 ft 2
A = (b1 + b2) x h
5 ft 2
A = (4 + 5) x 3 2
A = (9) x 3 27 =
= 13.5 ft2 2 2

6. Area of Polygons #6
The Area of a figure is the number of square units needed to cover it.
Rectangle
Parallelogram
Triangle 7 4 8 7 5 5 10 8

7. Area of a Circle #7
6 in
= 3.14 or 22 7

8. Given the Radius of a Circle#8
Given the Radius of a Circle
Round to the nearest hundredths place and include units!
5 ft
Find the Circumference
Find the Area

9. A= (Base1 + Base2) x Height
Area Formulas
# 9 h
Parallelogram
A= Base x Height b b1
A= (Base1 + Base2) x Height h
Trapezoid 2 b2
A= (Base x Height) h
Triangle 2 b h
Rectangle
A= Base x Height b s
Square
A= Side x Side s

10. ANOTHER WAY: Area of a Trapezoid
COMPOSITE FIGURES
#10
Area
20 m
13 m
12 m
5 m
25m
Perimeter
P =
P = 70 m
ANOTHER WAY: Area of a Trapezoid
A = (b1 + b2) x h 2

11. Perimeter & Area Review
# 11
Perimeter & Area Review
The Perimeter (P) is the distance around a figure. a c
P= a+b+c units b
The Area (A) of a figure is the number of square units needed to cover it.
height
A = 2 • 6
12 square units
12 units2
(h)
base
(b)

12. Area & Perimeter of a Triangle
# 12
5 cm
6 cm
Area
3 cm
9 cm
Perimeter
P = a + b + c
P =
P = 20 cm
copyright©amberpasillas2010

13. #13 Perimeter & Area of a Rectangle
The Perimeter of a figure is the distance around a figure.
5 in. 2 5 2
2 in.
2 in. + 5
5 in.
14 in.
The Area of a figure is the number of square units needed to cover it.
A = 3 • 2
6 square units
6 units2 2 3

14. Teacher Note: The following study guide slides were taken from the lesson on Perimeter and Area review under the PERIMETER FOLDER

15. Perimeter Examples Triangle Polygon Square Rectangle #9 P= a+b+ch b
P=a+b+c+d+e+f+g+h g c b f d e
Square
Rectangle
P=2l+2w s l
P=4s w w s s l s

16. #10 Perimeter of a Triangle
Perimeter: Distance around a geometric figure.
When you add the
sides, you are also
adding the units.
When you add units,
your UNITS DO NOT
CHANGE!
You must include units in every answer!

17. #11 Perimeter of a Rectangle & Square
The Perimeter of a figure is the distance around a figure.
5 in. 2 5 2
2 in.
2 in. + 5
5 in.
14 in.
Rectangle
Square 4
8 ft 5
8 ft