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#1
The Area of a figure is the number of
square units needed to cover it.
2
3
Rectangle
4
A=2 3
6 square units
6 units2
Square
8m
8m
5
A  l w
A  5 4
20 un 2
A = s2
A  88
64 m 2
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#2
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 =
squared
width
2
in
length
VOLUME: The number of cubic units
inside a figure.
length • width • height
3
cubed
in • in • in = in
copyright©amberpasillas2010
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height
width
length
#3
Area of a Parallelogram
To find the area for a parallelogram use what you know
about area of a rectangle.
A = base x height
3 in
5 in
A=bxh
2
=
15
in
A=5x3
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#4
Area of a Triangle
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
6m
8m
bh
A=
2
1
A= bh
2
A=8x6 =
2
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2
24 m
#5
Area of a Trapezoid
4 ft
A = (base1 + base2) x height
2
3 ft
A = (b1 + b2) x h
5 ft
2
A = (4 + 5) x 3
2
A = (9) x 3
2
=
27
2
= 13.5
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ft2
Area of Polygons
#6
The Area of a figure is the number of
square units needed to cover it.
Rectangle
A  l w
4
5
A  5 4
A  20 un2
Parallelogram
Triangle
A  b h
8 7
10
A  10  7
7
A  70 un2
5
8
b•h
A=
2
8  5

A
2
A  20 un2
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#7
A = π  radius squared
6 in
A = πr
2
A = (3.14)6
2
A = (3.14)  36
= 3.14 or 22
7
A = 113.04 in
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2
#8
5 ft
Round to the nearest
hundredths place and
include units!
Find the Circumference
C = 2 r
C = 2 5
C = 10
Find the Area
A = r
2
A =  52
A = 25
A = 78.54 ft 2
C = 31.42 ft
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#9
Parallelogram
Trapezoid
Triangle
h
b
b1
h
b2
A= Base x Height
A= (Base1 + Base2) x Height
2
A= (Base x Height)
2
Rectangle
A= Base x Height
Square
A= Side x Side
h
b
h
b
s
s
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#10
Area
20 m
13 m
5m
12 m
25m
Perimeter
Area1  l  w

20  12  240 m
2
bh

Area 2
2
5  12  30 m 2
P = 12 + 20 + 13 + 25
2
2
P = 70 m
Total Area
 270 m

ANOTHER WAY: Area of a Trapezoid
A = (b1 + b2) x h
2
12(25  20)

2
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 270m
2
# 11 Perimeter & Area Review
The Perimeter (P) is the distance
around a figure.
a
P= a+b+c units
c
b
The Area (A) of a figure is the number
of square units needed to cover it.
height
(h)
base (b)
A=2•6
12 square units
12 units2
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# 12 Area & Perimeter of a Triangle
5 cm
Area
6 cm
3 cm
9 cm
Perimeter
P=a+b+c
P=5+6+9
P = 20 cm
1
A  bh
2
1
A   9  3
2
1
A   27 
2
2
A  13.5 cm
copyright©amberpasillas2010
#13 Perimeter & Area of a Rectangle
The Perimeter of a figure is the distance around a figure.
2
5 in.
5 P  2l  2w
2
2 in.
2 in.
+ 5
14 in.
5 in.
The Area of a figure is the number of
square units needed to cover it.
2
3
A=3•2
6 square units
6 units2
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A  bh
Teacher Note: The following study
guide slides were taken from the
lesson on Perimeter and Area review
under the PERIMETER FOLDER
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#9
a
c
a
P= a+b+c
h
g
b
c
f
s
P=4s
s
s
P=a+b+c+d+e+f+g+h
b
e
d
l
w
w
l
s
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P=2l+2w
#10
Perimeter of a Triangle
Perimeter: Distance around a geometric figure.
a  3 cm
When you add the
b  5 cm
sides, you are also
c  7 cm adding the units.
P a bc
When you add units,
your UNITS DO NOT
P  3 5 7
CHANGE!
P  15 cm
You must include units in every answer!
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#11 Perimeter of a Rectangle & Square
The Perimeter of a figure is the distance around a figure.
2
5 in.
5
2
2 in.
2 in.
+ 5
14 in.
5 in.
Rectangle
4
5
Square
P  2l  2w
P  4s
8 ft
8 ft
P  2(5)  2(4)
10  8
P  4(8)
32 ft
18 units
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